Class: Steep::TypeConstruction

Inherits:
Object
  • Object
show all
Includes:
ModuleHelper, NodeHelper
Defined in:
lib/steep/type_construction.rb

Defined Under Namespace

Classes: Pair

Constant Summary collapse

SPECIAL_LVAR_NAMES = 

      
        
ANONYMOUS_BLOCK_PASSABLE_LVAR =
          

  

    

a synthetic variable name for anonymous block params (can’t conflict with user variables since Ruby doesn’t allow * in local variable names).



  





  



        

        
:"*block"

      
        
KNOWN_PURE_METHODS =
          
        

        

      
        
KERNEL_BLOCK_GIVEN =
          
        

        
MethodName("::Kernel#block_given?")

      
        
SPECIAL_METHOD_NAMES =
          
        

        
{
  array_compact: Set[
    MethodName("::Array#compact"),
    MethodName("::Enumerable#compact")
  ],
  hash_compact: Set[
    MethodName("::Hash#compact")
  ],
  lambda: Set[
    MethodName("::Kernel#lambda"),
    MethodName("::Kernel.lambda")
  ]
}

      
    

  




  
Instance Attribute Summary collapse

  




  
    

      Instance Method Summary
      collapse
    


    
  


  
  
  
  
  
  
  
  
  
Methods included from ModuleHelper

  
#module_name_from_node, #namespace_from_node


  
  
  
  
  
  
  
  
  
Methods included from NodeHelper

  
#clone_node, #deconstruct_case_node, #deconstruct_case_node!, #deconstruct_if_node, #deconstruct_if_node!, #deconstruct_resbody_node, #deconstruct_resbody_node!, #deconstruct_rescue_node, #deconstruct_rescue_node!, #deconstruct_send_node, #deconstruct_send_node!, #deconstruct_sendish_and_block_nodes, #deconstruct_when_node, #deconstruct_when_node!, #deconstruct_whileish_node, #deconstruct_whileish_node!, #each_child_node, #each_descendant_node, #private_send?, #test_case_node, #test_if_node, #test_resbody_node, #test_rescue_node, #test_send_node, #test_when_node, #test_whileish_node, #value_node?



  
Constructor Details

  
    

  

  
    #initialize(checker:, source:, annotations:, typing:, context:)  ⇒ TypeConstruction 
  

  

  


  

    

Returns a new instance of TypeConstruction.



  





  



  

    
      


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# File 'lib/steep/type_construction.rb', line 87

def initialize(checker:, source:, annotations:, typing:, context:)
  @checker = checker
  @source = source
  @annotations = annotations
  @typing = typing
  @context = context
end

    		
  





  



  

    
Instance Attribute Details

    
      
      
      

  

  
    #annotations  ⇒ Object  (readonly)
  

  

  


  

    

Returns the value of attribute annotations.



  





  



  

    
      


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# File 'lib/steep/type_construction.rb', line 50

def annotations
  @annotations
end

    		
  





    
      
      
      

  

  
    #checker  ⇒ Object  (readonly)
  

  

  


  

    

Returns the value of attribute checker.



  





  



  

    
      


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# File 'lib/steep/type_construction.rb', line 48

def checker
  @checker
end

    		
  





    
      
      
      

  

  
    #context  ⇒ Object  (readonly)
  

  

  


  

    

Returns the value of attribute context.



  





  



  

    
      


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# File 'lib/steep/type_construction.rb', line 53

def context
  @context
end

    		
  





    
      
      
      

  

  
    #source  ⇒ Object  (readonly)
  

  

  


  

    

Returns the value of attribute source.



  





  



  

    
      


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# File 'lib/steep/type_construction.rb', line 49

def source
  @source
end

    		
  





    
      
      
      

  

  
    #typing  ⇒ Object  (readonly)
  

  

  


  

    

Returns the value of attribute typing.



  





  



  

    
      


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# File 'lib/steep/type_construction.rb', line 51

def typing
  @typing
end

    		
  





    
  



  

    
Instance Method Details


    
      

  

  
    #absolute_name(name)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 4709

def absolute_name(name)
  checker.factory.absolute_type_name(name, context: nesting)
end

    		
  





    
      

  

  
    #add_call(call)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 716

def add_call(call)
  case call
  when TypeInference::MethodCall::NoMethodError
    typing.add_error(call.error)
  when TypeInference::MethodCall::Error
    call.errors.each do |error|
      typing.add_error(error)
    end
  end

  typing.add_typing(call.node, call.return_type, nil)
  typing.add_call(call.node, call)

  Pair.new(type: call.return_type, constr: self)
end

    		
  





    
      

  

  
    #add_typing(node, type:, constr: self)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 709

def add_typing(node, type:, constr: self)
  raise if constr.typing != self.typing

  typing.add_typing(node, type, nil)
  Pair.new(type: type, constr: constr)
end

    		
  





    
      

  

  
    #apply_solution(errors, node:, method_type:)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 3787

def apply_solution(errors, node:, method_type:)
  subst = yield

  [
    method_type.subst(subst),
    true,
    subst
  ]

rescue Subtyping::Constraints::UnsatisfiableConstraint => exn
  errors << Diagnostic::Ruby::UnsatisfiableConstraint.new(
    node: node,
    method_type: method_type,
    var: exn.var,
    sub_type: exn.sub_type,
    super_type: exn.super_type,
    result: exn.result
  )
  [method_type, false, Interface::Substitution.empty]
end

    		
  





    
      

  

  
    #arrayish_type?(type, untyped_is: false)  ⇒ Boolean 
  

  

  


  

    

  





  

Returns:


    
  
    
  • 
      
      
        (Boolean)
      
      
      
    
    • 
  





  

    
      


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# File 'lib/steep/type_construction.rb', line 5045

def arrayish_type?(type, untyped_is: false)
  case type
  when AST::Types::Any
    if untyped_is
      type
    end
  when AST::Types::Name::Instance
    if AST::Builtin::Array.instance_type?(type)
      type
    end
  when AST::Types::Tuple
    type
  when AST::Types::Name::Alias
    if t = checker.factory.deep_expand_alias(type)
      arrayish_type?(t)
    end
  end
end

    		
  





    
      

  

  
    #block_context  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 67

def block_context
  context.block_context
end

    		
  





    
      

  

  
    #block_context!  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 71

def block_context!
  block_context or raise
end

    		
  





    
      

  

  
    #break_context  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 75

def break_context
  context.break_context
end

    		
  





    
      

  

  
    #builder_config  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 3569

def builder_config
  Interface::Builder::Config.new(
    self_type: self_type,
    class_type: module_context.module_type,
    instance_type: module_context.instance_type,
    variable_bounds: context.variable_context.upper_bounds
  )
end

    		
  





    
      

  

  
    #bypass_splat(node)  ⇒ Object 
  

  

  


  

    

Bypass :splat and :kwsplat



  





  



  

    
      


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# File 'lib/steep/type_construction.rb', line 3775

def bypass_splat(node)
  splat = node.type == :splat || node.type == :kwsplat

  if splat
    pair = yield(node.children[0])
    pair.constr.add_typing(node, type: pair.type)
    pair
  else
    yield node
  end
end

    		
  





    
      

  

  
    #calculate_interface(type, method_name = nil, private:)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 3578

def calculate_interface(type, method_name = nil, private:)
  shape = checker.builder.shape(type, builder_config)

  unless private
    shape = shape&.public_shape
  end

  if method_name
    if shape
      shape.methods[method_name]
    end
  else
    shape
  end
end

    		
  





    
      

  

  
    #check(node, type, constraints: Subtyping::Constraints.empty)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 2728

def check(node, type, constraints: Subtyping::Constraints.empty)
  pair = synthesize(node, hint: type)

  result = check_relation(sub_type: pair.type, super_type: type, constraints: constraints)
  if result.failure?
    yield(type, pair.type, result)
    pair.with(type: type)
  else
    pair
  end
end

    		
  





    
      

  

  
    #check_deprecation_constant(name, node, location)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 5355

def check_deprecation_constant(name, node, location)
  entry = checker.builder.factory.env.constant_entry(name)

  annotations =
    case entry
    when RBS::Environment::ModuleEntry, RBS::Environment::ClassEntry
      entry.each_decl.flat_map do |decl|
        if decl.is_a?(RBS::AST::Declarations::Base)
          decl.annotations
        else
          []
        end
      end
    when RBS::Environment::ConstantEntry, RBS::Environment::ClassAliasEntry, RBS::Environment::ModuleAliasEntry
      if entry.decl.is_a?(RBS::AST::Declarations::Base)
        entry.decl.annotations
      else
        [] #: Array[RBS::AST::Annotation]
      end
    end

  if annotations
    if (_, message = AnnotationsHelper.deprecated_annotation?(annotations))
      typing.add_error(
        Diagnostic::Ruby::DeprecatedReference.new(
          node: node,
          location: location,
          message: message
        )
      )
    end
  end
end

    		
  





    
      

  

  
    #check_deprecation_global(name, node, location)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 5341

def check_deprecation_global(name, node, location)
  if global_entry = checker.factory.env.global_decls[name]
    if (_, message = AnnotationsHelper.deprecated_annotation?(global_entry.decl.annotations))
      typing.add_error(
        Diagnostic::Ruby::DeprecatedReference.new(
          node: node,
          location: location,
          message: message
        )
      )
    end
  end
end

    		
  





    
      

  

  
    #check_relation(sub_type:, super_type:, constraints: Subtyping::Constraints.empty)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 135

def check_relation(sub_type:, super_type:, constraints: Subtyping::Constraints.empty)
  Steep.logger.debug { "check_relation: self:#{self_type}, instance:#{module_context.instance_type}, class:#{module_context.module_type} |- #{sub_type} <: #{super_type}" }
  relation = Subtyping::Relation.new(sub_type: sub_type, super_type: super_type)
  checker.push_variable_bounds(variable_context.upper_bounds) do
    checker.check(
      relation,
      self_type: self_type,
      instance_type: module_context.instance_type,
      class_type: module_context.module_type,
      constraints: constraints
    )
  end
end

    		
  





    
      

  

  
    #deep_expand_alias(type)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 4898

def deep_expand_alias(type)
  checker.factory.deep_expand_alias(type)
end

    		
  





    
      

  

  
    #default_module_context(implement_module_name, nesting:)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 336

def default_module_context(implement_module_name, nesting:)
  if implement_module_name
    module_name = checker.factory.absolute_type_name(implement_module_name.name, context: nesting) or raise
    module_args = implement_module_name.args.map {|name| AST::Types::Var.new(name: name) }

    instance_def = checker.factory.definition_builder.build_instance(module_name)
    module_def = checker.factory.definition_builder.build_singleton(module_name)

    instance_type = AST::Types::Name::Instance.new(name: module_name, args: module_args)
    module_type = AST::Types::Name::Singleton.new(name: module_name)

    TypeInference::Context::ModuleContext.new(
      instance_type: instance_type,
      module_type: module_type,
      implement_name: implement_module_name,
      nesting: nesting,
      class_name: module_name,
      instance_definition: instance_def,
      module_definition: module_def
    )
  else
    TypeInference::Context::ModuleContext.new(
      instance_type: AST::Builtin::Object.instance_type,
      module_type: AST::Builtin::Object.module_type,
      implement_name: nil,
      nesting: nesting,
      class_name: self.module_context.class_name,
      module_definition: nil,
      instance_definition: nil
    )
  end
end

    		
  





    
      

  

  
    #deprecated_send?(call)  ⇒ Boolean 
  

  

  


  

    

  





  

Returns:


    
  
    
  • 
      
      
        (Boolean)
      
      
      
    
    • 
  





  

    
      


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# File 'lib/steep/type_construction.rb', line 3268

def deprecated_send?(call)
  return unless call.node.type == :send || call.node.type == :csend

  call.method_decls.each do |decl|
    if pair = AnnotationsHelper.deprecated_annotation?(decl.method_def.each_annotation.to_a)
      return pair
    end
  end

  nil
end

    		
  





    
      

  

  
    #eliminate_vars(type, variables, to: AST::Builtin.any_type)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 3808

def eliminate_vars(type, variables, to: AST::Builtin.any_type)
  if variables.empty?
    type
  else
    subst = Interface::Substitution.build(variables, Array.new(variables.size, to))
    type.subst(subst)
  end
end

    		
  





    
      

  

  
    #expand_alias(type, &block)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 4927

def expand_alias(type, &block)
  typ = checker.factory.expand_alias(type)
  if block
    yield(typ)
  else
    typ
  end
end

    		
  





    
      

  

  
    #expand_self(type)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 3594

def expand_self(type)
  if type.is_a?(AST::Types::Self) && self_type
    self_type
  else
    type
  end
end

    		
  





    
      

  

  
    #fallback_to_any(node)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 4855

def fallback_to_any(node)
  if block_given?
    typing.add_error yield
  else
    typing.add_error Diagnostic::Ruby::FallbackAny.new(node: node)
  end

  add_typing node, type: AST::Builtin.any_type
end

    		
  





    
      

  

  
    #flatten_array_elements(type)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 4916

def flatten_array_elements(type)
  flatten_union(deep_expand_alias(type) || type).flat_map do |type|
    if AST::Builtin::Array.instance_type?(type)
      # @type var type: AST::Types::Name::Instance
      type.args
    else
      [type]
    end
  end
end

    		
  





    
      

  

  
    #flatten_union(type)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 4902

def flatten_union(type)
  checker.factory.flatten_union(type)
end

    		
  





    
      

  

  
    #for_block(body_node, block_params:, block_param_hint:, block_next_type:, block_block_hint:, block_annotations:, node_type_hint:, block_self_hint:)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 4547

def for_block(body_node, block_params:, block_param_hint:, block_next_type:, block_block_hint:, block_annotations:, node_type_hint:, block_self_hint:)
  block_param_pairs = block_param_hint && block_params.zip(block_param_hint, block_block_hint, factory: checker.factory)

  # @type var param_types_hash: Hash[Symbol?, AST::Types::t]
  param_types_hash = {}
  if block_param_pairs
    block_param_pairs.each do |param, type|
      case param
      when TypeInference::BlockParams::Param
        var_name = param.var
        param_types_hash[var_name] = type
      when TypeInference::BlockParams::MultipleParam
        set_up_block_mlhs_params_env(param.node, type, param_types_hash) do |error_node, non_array_type|
          Steep.logger.fatal { "`#{non_array_type}#to_ary` returns non-array-ish type" }
          annotation_types = param.variable_types()
          each_descendant_node(error_node) do |n|
            if n.type == :arg
              name = n.children[0]
              param_types_hash[name] = annotation_types[name] || AST::Builtin.any_type
            end
          end
        end
      end
    end
  else
    block_params.each do |param|
      case param
      when TypeInference::BlockParams::Param
        var_name = param.var
        param_types_hash[var_name] = param.type || AST::Builtin.any_type
      when TypeInference::BlockParams::MultipleParam
        param.each_param do |p|
          param_types_hash[p.var] = p.type || AST::Builtin.any_type
        end
      end
    end
  end

  param_types_hash.delete_if {|name, _| name && SPECIAL_LVAR_NAMES.include?(name) }

  param_types = param_types_hash.each.with_object({}) do |pair, hash| #$ Hash[Symbol, [AST::Types::t, AST::Types::t?]]
    name, type = pair
    # skip unnamed arguments `*`, `**` and `&`
    next if name.nil?
    hash[name] = [type, nil]
  end

  pins = context.type_env.pin_local_variables(nil)

  type_env = context.type_env
  type_env = type_env.invalidate_pure_node(Parser::AST::Node.new(:self)) if block_self_hint || block_annotations.self_type
  type_env = type_env.merge(local_variable_types: pins)
  type_env = type_env.merge(local_variable_types: param_types)
  type_env = TypeInference::TypeEnvBuilder.new(
    if self_binding = block_annotations.self_type || block_self_hint
      definition =
        case self_binding
        when AST::Types::Name::Instance
          checker.factory.definition_builder.build_instance(self_binding.name)
        when AST::Types::Name::Singleton
          checker.factory.definition_builder.build_singleton(self_binding.name)
        end

      if definition
        TypeInference::TypeEnvBuilder::Command::ImportInstanceVariableDefinition.new(definition, checker.factory)
      end
    end,
    TypeInference::TypeEnvBuilder::Command::ImportLocalVariableAnnotations.new(block_annotations).merge!.on_duplicate! do |name, outer_type, inner_type|
      next if outer_type.is_a?(AST::Types::Var) || inner_type.is_a?(AST::Types::Var)
      next unless body_node

      if result = no_subtyping?(sub_type: outer_type, super_type: inner_type)
        typing.add_error Diagnostic::Ruby::IncompatibleAnnotation.new(
          node: body_node,
          var_name: name,
          result: result,
          relation: result.relation
        )
      end
    end
  ).build(type_env)

  break_type = if block_annotations.break_type
                 union_type(node_type_hint, block_annotations.break_type)
               else
                 node_type_hint
               end

  block_context = TypeInference::Context::BlockContext.new(
    body_type: block_annotations.block_type
  )
  break_context = TypeInference::Context::BreakContext.new(
    break_type: break_type || AST::Builtin.any_type,
    next_type: block_next_type || AST::Builtin.any_type
  )

  self_type = block_self_hint || self.self_type
  module_context = self.module_context

  if implements = block_annotations.implement_module_annotation
    module_context = default_module_context(implements.name, nesting: nesting)
    self_type = module_context.module_type
  end

  if annotation_self_type = block_annotations.self_type
    self_type = annotation_self_type
  end

  # self_type here means the top-level `self` type because of the `Interface::Builder` implementation
  if self_type
    self_type = expand_self(self_type)
  end

  self.class.new(
    checker: checker,
    source: source,
    annotations: annotations.merge_block_annotations(block_annotations),
    typing: typing,
    context: TypeInference::Context.new(
      block_context: block_context,
      method_context: method_context,
      module_context: module_context,
      break_context: break_context,
      self_type: self_type,
      type_env: type_env,
      call_context: self.context.call_context,
      variable_context: variable_context
    )
  )
end

    		
  





    
      

  

  
    #for_branch(node, break_context: context.break_context)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 685

def for_branch(node, break_context: context.break_context)
  annots = source.annotations(block: node, factory: checker.factory, context: nesting)

  type_env = TypeInference::TypeEnvBuilder.new(
    TypeInference::TypeEnvBuilder::Command::ImportLocalVariableAnnotations.new(annots).merge!.on_duplicate! do |name, outer_type, annotation_type|
      relation = Subtyping::Relation.new(sub_type: annotation_type, super_type: outer_type)
      if result = no_subtyping?(sub_type: annotation_type, super_type: outer_type)
        typing.add_error(
          Diagnostic::Ruby::IncompatibleAnnotation.new(
            node: node,
            var_name: name,
            relation: relation,
            result: result
          )
        )
      end
    end
  ).build(context.type_env)

  update_context do |context|
    context.with(type_env: type_env, break_context: break_context)
  end
end

    		
  





    
      

  

  
    #for_class(node, new_class_name, super_class_name)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 488

def for_class(node, new_class_name, super_class_name)
  new_nesting = [nesting, new_class_name || false] #: RBS::Resolver::context
  annots = source.annotations(block: node, factory: checker.factory, context: new_nesting)

  class_const_env = TypeInference::ConstantEnv.new(
    factory: checker.factory,
    context: new_nesting,
    resolver: context.type_env.constant_env.resolver
  )

  implement_module_name = implement_module(module_name: new_class_name, super_name: super_class_name, annotations: annots)
  module_context = default_module_context(implement_module_name, nesting: new_nesting)

  if implement_module_name
    if super_class_name && implement_module_name.name == absolute_name(super_class_name)
      module_context = module_context.update(instance_definition: nil, module_definition: nil)
    end

    if !checker.factory.definition_builder.env.class_entry(implement_module_name.name, normalized: true) &&
      checker.factory.definition_builder.env.module_entry(implement_module_name.name, normalized: true)
      typing.add_error(
        Diagnostic::Ruby::ClassModuleMismatch.new(node: node, name: new_class_name)
      )
    end
  else
    module_context = module_context.update(
      instance_type: AST::Builtin::Object.instance_type,
      module_type: AST::Builtin::Object.module_type
    )
  end

  if annots.instance_type
    module_context = module_context.update(instance_type: annots.instance_type)
  end

  if annots.module_type
    module_context = module_context.update(module_type: annots.module_type)
  end

  if annots.self_type
    module_context = module_context.update(module_type: annots.self_type)
  end

  definition = checker.factory.definition_builder.build_instance(module_context.class_name)
  type_params = definition.type_params_decl.map do |type_param|
    Interface::TypeParam.new(
      name: type_param.name,
      upper_bound: type_param.upper_bound_type&.yield_self {|t| checker.factory.type(t) },
      variance: type_param.variance,
      unchecked: type_param.unchecked?,
      location: type_param.location,
      default_type: checker.factory.type_opt(type_param.default_type)
    )
  end
  variable_context = TypeInference::Context::TypeVariableContext.new(type_params)

  singleton_definition = checker.factory.definition_builder.build_singleton(module_context.class_name)
  class_type_env = TypeInference::TypeEnvBuilder.new(
    TypeInference::TypeEnvBuilder::Command::ImportGlobalDeclarations.new(checker.factory),
    TypeInference::TypeEnvBuilder::Command::ImportConstantAnnotations.new(annots),
    TypeInference::TypeEnvBuilder::Command::ImportLocalVariableAnnotations.new(annots),
    TypeInference::TypeEnvBuilder::Command::ImportInstanceVariableDefinition.new(singleton_definition, checker.factory),
  ).build(TypeInference::TypeEnv.new(class_const_env))

  class_body_context = TypeInference::Context.new(
    method_context: nil,
    block_context: nil,
    module_context: module_context,
    break_context: nil,
    self_type: module_context.module_type,
    type_env: class_type_env,
    call_context: TypeInference::MethodCall::ModuleContext.new(type_name: module_context.class_name),
    variable_context: variable_context
  )

  self.class.new(
    checker: checker,
    source: source,
    annotations: annots,
    typing: typing,
    context: class_body_context
  )
end

    		
  





    
      

  

  
    #for_module(node, new_module_name)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 369

def for_module(node, new_module_name)
  new_nesting = [nesting, new_module_name || false] #: RBS::Resolver::context

  annots = source.annotations(block: node, factory: checker.factory, context: new_nesting)

  implement_module_name = implement_module(module_name: new_module_name, annotations: annots)
  module_context = default_module_context(implement_module_name, nesting: new_nesting)

  unless implement_module_name
    module_context = module_context.update(
      module_type: AST::Builtin::Module.instance_type,
      instance_type: AST::Builtin::BasicObject.instance_type
    )
  end

  if implement_module_name
    module_entry = checker.factory.definition_builder.env.module_entry(implement_module_name.name, normalized: true)
    if module_entry
      module_context = module_context.update(
        instance_type: AST::Types::Intersection.build(
          types: [
            AST::Builtin::Object.instance_type,
            *module_entry.self_types.map {|module_self|
              type = case
                    when module_self.name.interface?
                      RBS::Types::Interface.new(
                        name: module_self.name,
                        args: module_self.args,
                        location: module_self.location
                      )
                    when module_self.name.class?
                      RBS::Types::ClassInstance.new(
                        name: module_self.name,
                        args: module_self.args,
                        location: module_self.location
                      )
                    else
                      raise
                    end
              checker.factory.type(type)
            },
            module_context.instance_type
          ].compact
        )
      )
    elsif checker.factory.definition_builder.env.class_entry(implement_module_name.name, normalized:true)
      typing.add_error(
        Diagnostic::Ruby::ClassModuleMismatch.new(node: node, name: new_module_name)
      )
    end
  end

  if annots.instance_type
    module_context = module_context.update(instance_type: annots.instance_type)
  end

  if annots.module_type
    module_context = module_context.update(module_type: annots.module_type)
  end

  if annots.self_type
    module_context = module_context.update(module_type: annots.self_type)
  end

  if implement_module_name
    definition = checker.factory.definition_builder.build_instance(implement_module_name.name)
    type_params = definition.type_params_decl.map do |param|
      Interface::TypeParam.new(
        name: param.name,
        upper_bound: checker.factory.type_opt(param.upper_bound_type),
        variance: param.variance,
        unchecked: param.unchecked?,
        default_type: checker.factory.type_opt(param.default_type)
      )
    end
    variable_context = TypeInference::Context::TypeVariableContext.new(type_params)
  else
    variable_context = TypeInference::Context::TypeVariableContext.empty
  end

  module_const_env = TypeInference::ConstantEnv.new(
    factory: checker.factory,
    context: new_nesting,
    resolver: context.type_env.constant_env.resolver
  )

  module_type_env = TypeInference::TypeEnvBuilder.new(
    TypeInference::TypeEnvBuilder::Command::ImportGlobalDeclarations.new(checker.factory),
    TypeInference::TypeEnvBuilder::Command::ImportLocalVariableAnnotations.new(annots),
    TypeInference::TypeEnvBuilder::Command::ImportInstanceVariableDefinition.new(module_context.module_definition, checker.factory),
    TypeInference::TypeEnvBuilder::Command::ImportInstanceVariableAnnotations.new(annots).merge!,
    TypeInference::TypeEnvBuilder::Command::ImportConstantAnnotations.new(annots)
  ).build(TypeInference::TypeEnv.new(module_const_env))

  self.class.new(
    checker: checker,
    source: source,
    annotations: annots,
    typing: typing,
    context: TypeInference::Context.new(
      method_context: nil,
      block_context: nil,
      break_context: nil,
      module_context: module_context,
      self_type: module_context.module_type,
      type_env: module_type_env,
      call_context: TypeInference::MethodCall::ModuleContext.new(type_name: module_context.class_name),
      variable_context: variable_context
    )
  )
end

    		
  





    
      

  

  
    #for_new_method(method_name, node, args:, self_type:, definition:)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 156

def for_new_method(method_name, node, args:, self_type:, definition:)
  annots = source.annotations(block: node, factory: checker.factory, context: nesting)
  definition_method_type = if definition
                             definition.methods[method_name]&.yield_self do |method|
                               method.method_types
                                 .map {|method_type| checker.factory.method_type(method_type) }
                                 .inject {|t1, t2| t1 + t2}
                             end
                           end
  annotation_method_type = annotations.method_type(method_name)

  method_type = annotation_method_type || definition_method_type

  unless method_type
    if definition
      typing.add_error(
        Diagnostic::Ruby::UndeclaredMethodDefinition.new(method_name: method_name, type_name: definition.type_name, node: node)
      )
    else
      typing.add_error(
        Diagnostic::Ruby::MethodDefinitionInUndeclaredModule.new(method_name: method_name, node: node)
      )
    end
  end

  if (annotation_return_type = annots&.return_type) && (method_type_return_type = method_type&.type&.return_type)
    check_relation(sub_type: annotation_return_type, super_type: method_type_return_type).else do |result|
      typing.add_error(
        Diagnostic::Ruby::MethodReturnTypeAnnotationMismatch.new(
          node: node,
          method_type: method_type.type.return_type,
          annotation_type: annots.return_type,
          result: result
        )
      )
    end
  end

  # constructor_method = method&.attributes&.include?(:constructor)

  super_method = if definition
                   if (this_method = definition.methods[method_name])
                     if module_context&.class_name == this_method.defined_in
                       this_method.super_method
                     else
                       this_method
                     end
                   end
                 end

  if definition && method_type
    variable_context = TypeInference::Context::TypeVariableContext.new(method_type.type_params, parent_context: self.variable_context)
  else
    variable_context = self.variable_context
  end

  method_params =
    if method_type
      TypeInference::MethodParams.build(node: node, method_type: method_type)
    else
      TypeInference::MethodParams.empty(node: node)
    end

  block_param_name = nil #: Symbol?
  method_params.each_param do |param|
    if param.is_a?(TypeInference::MethodParams::BlockParameter)
      block_param_name = param.name || ANONYMOUS_BLOCK_PASSABLE_LVAR
    end
  end

  method_context = TypeInference::Context::MethodContext.new(
    name: method_name,
    method: definition && definition.methods[method_name],
    method_type: method_type,
    return_type: annots.return_type || method_type&.type&.return_type || AST::Builtin.any_type,
    super_method: super_method,
    forward_arg_type: method_params.forward_arg_type,
    block_param_name: block_param_name
  )

  local_variable_types = method_params.each_param.with_object({}) do |param, hash| #$ Hash[Symbol, AST::Types::t]
    if param.name
      unless SPECIAL_LVAR_NAMES.include?(param.name)
        hash[param.name] = param.var_type
      end
    elsif param.is_a?(TypeInference::MethodParams::BlockParameter)
      hash[ANONYMOUS_BLOCK_PASSABLE_LVAR] = param.var_type
    end
  end
  type_env = context.type_env.assign_local_variables(local_variable_types)

  type_env = TypeInference::TypeEnvBuilder.new(
    TypeInference::TypeEnvBuilder::Command::ImportLocalVariableAnnotations.new(annots).merge!.on_duplicate! do |name, original, annotated|
      if method_params.param?(name)
        param = method_params[name]
        if result = no_subtyping?(sub_type: original, super_type: annotated)
          typing.add_error Diagnostic::Ruby::IncompatibleAnnotation.new(
            node: param.node,
            var_name: name,
            result: result,
            relation: result.relation
          )
        end
      end
    end,
    TypeInference::TypeEnvBuilder::Command::ImportInstanceVariableDefinition.new(definition, checker.factory),
    TypeInference::TypeEnvBuilder::Command::ImportInstanceVariableAnnotations.new(annots).merge!
  ).build(type_env)

  method_params.errors.each do |error|
    typing.add_error error
  end

  call_context = case self_type
                 when nil
                   TypeInference::MethodCall::UnknownContext.new()
                 when AST::Types::Name::Singleton
                   TypeInference::MethodCall::MethodContext.new(
                     method_name: SingletonMethodName.new(type_name: module_context.class_name, method_name: method_name)
                   )
                 when AST::Types::Name::Instance, AST::Types::Intersection
                   TypeInference::MethodCall::MethodContext.new(
                     method_name: InstanceMethodName.new(type_name: module_context.class_name, method_name: method_name)
                   )
                 else
                   raise "Unexpected self_type: #{self_type}"
                 end

  self.class.new(
    checker: checker,
    source: source,
    annotations: annots,
    context: TypeInference::Context.new(
      method_context: method_context,
      module_context: module_context,
      block_context: nil,
      break_context: nil,
      self_type: annots.self_type || self_type,
      type_env: type_env,
      call_context: call_context,
      variable_context: variable_context
    ),
    typing: typing,
  )
end

    		
  





    
      

  

  
    #for_sclass(node, type)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 599

def for_sclass(node, type)
  annots = source.annotations(block: node, factory: checker.factory, context: nesting)

  instance_type = if type.is_a?(AST::Types::Self)
                    context.self_type
                  else
                    type
                  end

  module_type = case instance_type
                when AST::Types::Name::Singleton
                  type_name = instance_type.name

                  case checker.factory.env.constant_entry(type_name)
                  when RBS::Environment::ModuleEntry, RBS::Environment::ModuleAliasEntry
                    AST::Builtin::Module.instance_type
                  when RBS::Environment::ClassEntry, RBS::Environment::ClassAliasEntry
                    AST::Builtin::Class.instance_type
                  else
                    raise
                  end

                when AST::Types::Name::Instance
                  instance_type.to_module
                else
                  return
                end

  instance_definition = case instance_type
                        when AST::Types::Name::Singleton
                          type_name = instance_type.name
                          checker.factory.definition_builder.build_singleton(type_name)
                        when AST::Types::Name::Instance
                          type_name = instance_type.name
                          checker.factory.definition_builder.build_instance(type_name)
                        else
                          return
                        end

  module_definition = case module_type
                      when AST::Types::Name::Singleton
                        type_name = module_type.name
                        checker.factory.definition_builder.build_singleton(type_name)
                      else
                        nil
                      end

  module_context = TypeInference::Context::ModuleContext.new(
    instance_type: annots.instance_type || instance_type,
    module_type: annots.self_type || annots.module_type || module_type,
    implement_name: nil,
    nesting: nesting,
    class_name: self.module_context.class_name,
    module_definition: module_definition,
    instance_definition: instance_definition
  )

  singleton_definition = checker.factory.definition_builder.build_singleton(module_context.class_name)
  type_env =
    TypeInference::TypeEnvBuilder.new(
      TypeInference::TypeEnvBuilder::Command::ImportGlobalDeclarations.new(checker.factory),
      TypeInference::TypeEnvBuilder::Command::ImportConstantAnnotations.new(annots),
      TypeInference::TypeEnvBuilder::Command::ImportLocalVariableAnnotations.new(annots),
      TypeInference::TypeEnvBuilder::Command::ImportInstanceVariableDefinition.new(instance_definition, checker.factory)
    ).build(TypeInference::TypeEnv.new(context.type_env.constant_env))

  body_context = TypeInference::Context.new(
    method_context: nil,
    block_context: nil,
    module_context: module_context,
    break_context: nil,
    self_type: meta_type(annots.self_type || type) || AST::Builtin::Class.module_type,
    type_env: type_env,
    call_context: TypeInference::MethodCall::ModuleContext.new(type_name: module_context.class_name),
    variable_context: TypeInference::Context::TypeVariableContext.empty  # Assuming `::Class` and `::Module` don't have type params
  )

  self.class.new(
    checker: checker,
    source: source,
    annotations: annots,
    typing: typing,
    context: body_context
  )
end

    		
  





    
      

  

  
    #gvasgn(node, rhs_type)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 2842

def gvasgn(node, rhs_type)
  name = node.children[0]

  lhs_type = context.type_env[name]

  if lhs_type
    if result = no_subtyping?(sub_type: rhs_type, super_type: lhs_type)
      typing.add_error(
        Diagnostic::Ruby::IncompatibleAssignment.new(node: node, lhs_type: lhs_type, rhs_type: rhs_type, result: result)
      )
    end
  else
    typing.add_error(Diagnostic::Ruby::UnknownGlobalVariable.new(node: node, name: name))
  end

  add_typing(node, type: rhs_type)
end

    		
  





    
      

  

  
    #implement_module(module_name:, super_name: nil, annotations:)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 309

def implement_module(module_name:, super_name: nil, annotations:)
  if (annotation = annotations.implement_module_annotation)
    absolute_name(annotation.name.name).yield_self do |absolute_name|
      if checker.factory.class_name?(absolute_name) || checker.factory.module_name?(absolute_name)
        AST::Annotation::Implements::Module.new(
          name: absolute_name,
          args: annotation.name.args
        )
      else
        Steep.logger.error "Unknown class name given to @implements: #{annotation.name.name}"
        nil
      end
    end
  else
    name = module_name || super_name

    if name && checker.factory.env.module_name?(name)
      definition = checker.factory.definition_builder.build_instance(name)

      AST::Annotation::Implements::Module.new(
        name: name,
        args: definition.type_params
      )
    end
  end
end

    		
  





    
      

  

  
    #inspect  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 35

def inspect
  s = "#<%s:%#018x " % [self.class, object_id]
  s + ">"
end

    		
  





    
      

  

  
    #instance_type(type)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 5324

def instance_type(type)
  case type
  when AST::Types::Union
    AST::Types::Union.build(
      types: type.types.map {|t| instance_type(t) or return }
    )
  when AST::Types::Intersection
    AST::Types::Intersection.build(
      types: type.types.map {|t| instance_type(t) or return }
    )
  else
    if name = type_name(type)
      checker.factory.instance_type(name)
    end
  end
end

    		
  





    
      

  

  
    #ivasgn(node, rhs_type)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 2824

def ivasgn(node, rhs_type)
  name = node.children[0]

  lhs_type = context.type_env[name]

  if lhs_type
    if (result = check_relation(sub_type: rhs_type, super_type: lhs_type)).failure?
      typing.add_error(
        Diagnostic::Ruby::IncompatibleAssignment.new(node: node, lhs_type: lhs_type, rhs_type: rhs_type, result: result)
      )
    end
  else
    typing.add_error(Diagnostic::Ruby::UnknownInstanceVariable.new(node: node, name: name))
  end

  add_typing(node, type: rhs_type)
end

    		
  





    
      

  

  
    #lvasgn(node, type)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 2798

def lvasgn(node, type)
  name = node.children[0]

  if SPECIAL_LVAR_NAMES.include?(name)
    add_typing(node, type: AST::Builtin.any_type)
  else
    if enforced_type = context.type_env.enforced_type(name)
      if result = no_subtyping?(sub_type: type, super_type: enforced_type)
        typing.add_error(
          Diagnostic::Ruby::IncompatibleAssignment.new(
            node: node,
            lhs_type: enforced_type,
            rhs_type: type,
            result: result
          )
        )

        type = enforced_type
      end
    end

    update_type_env {|env| env.assign_local_variable(name, type, enforced_type) }
      .add_typing(node, type: type)
  end
end

    		
  





    
      

  

  
    #masgn_lhs?(lhs)  ⇒ Boolean 
  

  

  


  

    

  





  

Returns:


    
  
    
  • 
      
      
        (Boolean)
      
      
      
    
    • 
  





  

    
      


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# File 'lib/steep/type_construction.rb', line 2787

def masgn_lhs?(lhs)
  lhs.children.all? do |a|
    asgn_type = if a.type == :splat
                  a.children[0]&.type
                else
                  a.type
                end
    asgn_type.nil? || asgn_type == :lvasgn || asgn_type == :ivasgn || asgn_type == :gvasgn
  end
end

    		
  





    
      

  

  
    #meta_type(type)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 590

def meta_type(type)
  case type
  when AST::Types::Name::Instance
    type.to_module
  when AST::Types::Name::Singleton
    AST::Builtin::Class.instance_type
  end
end

    		
  





    
      

  

  
    #method_context  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 59

def method_context
  context.method_context
end

    		
  





    
      

  

  
    #method_context!  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 63

def method_context!
  method_context or raise
end

    		
  





    
      

  

  
    #module_context  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 55

def module_context
  context.module_context
end

    		
  





    
      

  

  
    #namespace_module?(node)  ⇒ Boolean 
  

  

  


  

    

  





  

Returns:


    
  
    
  • 
      
      
        (Boolean)
      
      
      
    
    • 
  





  

    
      


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# File 'lib/steep/type_construction.rb', line 4865

def namespace_module?(node)
  # @type var nodes: Array[Parser::AST::Node]
  nodes =
    case node.type
    when :class, :module
      node.children.last&.yield_self {|child|
        if child.type == :begin
          child.children
        else
          [child]
        end
      } || []
    else
      return false
    end

  !nodes.empty? && nodes.all? {|child| child.type == :class || child.type == :module}
end

    		
  





    
      

  

  
    #nesting  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 4705

def nesting
  module_context&.nesting
end

    		
  





    
      

  

  
    #no_subtyping?(sub_type:, super_type:, constraints: Subtyping::Constraints.empty)  ⇒ Boolean 
  

  

  


  

    

  





  

Returns:


    
  
    
  • 
      
      
        (Boolean)
      
      
      
    
    • 
  





  

    
      


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# File 'lib/steep/type_construction.rb', line 149

def no_subtyping?(sub_type:, super_type:, constraints: Subtyping::Constraints.empty)
  result = check_relation(sub_type: sub_type, super_type: super_type, constraints: constraints)
  if result.failure?
    result
  end
end

    		
  





    
      

  

  
    #optional_proc?(type)  ⇒ Boolean 
  

  

  


  

    

  





  

Returns:


    
  
    
  • 
      
      
        (Boolean)
      
      
      
    
    • 
  





  

    
      


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# File 'lib/steep/type_construction.rb', line 3086

def optional_proc?(type)
  if type.is_a?(AST::Types::Union)
    if type.types.size == 2
      if type.types.find {|t| t.is_a?(AST::Types::Nil) }
        if proc_type = type.types.find {|t| t.is_a?(AST::Types::Proc) }
          proc_type #: AST::Types::Proc
        end
      end
    end
  end
end

    		
  





    
      

  

  
    #partition_flatten_types(type, &block)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 4911

def partition_flatten_types(type, &block)
  types = flatten_union(deep_expand_alias(type) || type)
  types.partition(&block)
end

    		
  





    
      

  

  
    #pick_one_of(types)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 5270

def pick_one_of(types)
  types.each do |type|
    with_child_typing() do |constr|
      if (type_, constr = yield(type, constr))
        constr.check_relation(sub_type: type_, super_type: type).then do
          constr = constr.save_typing
          return Pair.new(type: type_, constr: constr)
        end
      end
    end
  end

  nil
end

    		
  





    
      

  

  
    #pure_send?(call, receiver, arguments)  ⇒ Boolean 
  

  

  


  

    

  





  

Returns:


    
  
    
  • 
      
      
        (Boolean)
      
      
      
    
    • 
  





  

    
      


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# File 'lib/steep/type_construction.rb', line 3256

def pure_send?(call, receiver, arguments)
  return false unless call.node.type == :send || call.node.type == :csend
  return false unless call.pure? || KNOWN_PURE_METHODS.superset?(Set.new(call.method_decls.map(&:method_name)))

  argishes = [*arguments]
  argishes << receiver if receiver

  argishes.all? do |node|
    value_node?(node) || context.type_env[node]
  end
end

    		
  





    
      

  

  
    #save_typing  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 5285

def save_typing
  typing.save!
  with_new_typing(typing.parent || raise)
end

    		
  





    
      

  

  
    #select_flatten_types(type, &block)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 4906

def select_flatten_types(type, &block)
  types = flatten_union(deep_expand_alias(type) || type)
  types.select(&block)
end

    		
  





    
      

  

  
    #self_type  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 79

def self_type
  context.self_type
end

    		
  





    
      

  

  
    #semantically_arrayish_type?(type)  ⇒ Boolean 
  

  

  


  

    

  





  

Returns:


    
  
    
  • 
      
      
        (Boolean)
      
      
      
    
    • 
  





  

    
      


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# File 'lib/steep/type_construction.rb', line 5064

def semantically_arrayish_type?(type)
  union = AST::Types::Union.build(types: flatten_union(type))
  if union.is_a?(AST::Types::Union)
    if tuple = union_of_tuple_to_tuple_of_union(union)
      return tuple
    end
  end

  var = AST::Types::Var.fresh(:Elem)
  array = AST::Builtin::Array.instance_type(var)
  constraints = Subtyping::Constraints.new(unknowns: [])
  constraints.add_var(var.name)

  if (result = check_relation(sub_type: type, super_type: array, constraints: constraints)).success?
    context = Subtyping::Constraints::Context.new(
      variance: Subtyping::VariableVariance.from_type(union_type(type, var)),
      self_type: self_type,
      instance_type: module_context.instance_type,
      class_type: module_context.module_type
    )

    variables = (type.free_variables + [var.name]).filter_map do |name|
      case name
      when Symbol
        name
      end
    end
    subst = constraints.solution(checker, variables: variables, context: context)

    type.subst(subst)
  end
end

    		
  





    
      

  

  
    #set_up_block_mlhs_params_env(node, type, hash, &block)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 4529

def set_up_block_mlhs_params_env(node, type, hash, &block)
  if arrayish = try_convert_to_array(type)
    masgn = TypeInference::MultipleAssignment.new()
    assignments = masgn.expand(node, arrayish, false) or raise "#{arrayish} is expected to be array-ish"
    assignments.leading_assignments.each do |pair|
      node, type = pair

      if node.type == :arg
        hash[node.children[0]] = type
      else
        set_up_block_mlhs_params_env(node, type, hash, &block)
      end
    end
  else
    yield node, type
  end
end

    		
  





    
      

  

  
    #singleton_type(type)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 5307

def singleton_type(type)
  case type
  when AST::Types::Union
    AST::Types::Union.build(
      types: type.types.map {|t| singleton_type(t) or return }
    )
  when AST::Types::Intersection
    AST::Types::Intersection.build(
      types: type.types.map {|t| singleton_type(t) or return }
    )
  else
    if name = type_name(type)
      AST::Types::Name::Singleton.new(name: name)
    end
  end
end

    		
  





    
      

  

  
    #synthesize(node, hint: nil, condition: false)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 732

def synthesize(node, hint: nil, condition: false)
  Steep.logger.tagged "synthesize:(#{node.location&.yield_self {|loc| loc.expression.to_s.split(/:/, 2).last } || "-"})" do
    Steep.logger.debug node.type
    case node.type
    when :begin, :kwbegin
      yield_self do
        end_pos = node.loc.expression.end_pos

        *mid_nodes, last_node = each_child_node(node).to_a
        if last_node
          pair = mid_nodes.inject(Pair.new(type: AST::Builtin.nil_type, constr: self)) do |pair, node|
            pair.constr.synthesize(node).yield_self {|p| pair + p }.tap do |new_pair|
              if new_pair.constr.context != pair.constr.context
                # update context
                range = node.loc.expression.end_pos..end_pos
                typing.cursor_context.set(range, new_pair.constr.context)
              end
            end
          end

          p = pair.constr.synthesize(last_node, hint: hint, condition: condition)
          last_pair = pair + p
          last_pair.constr.add_typing(node, type: last_pair.type, constr: last_pair.constr)
        else
          add_typing(node, type: AST::Builtin.nil_type)
        end
      end

    when :lvasgn
      yield_self do
        name, rhs = node.children

        case name
        when :_, :__any__
          synthesize(rhs, hint: AST::Builtin.any_type).yield_self do |pair|
            add_typing(node, type: AST::Builtin.any_type, constr: pair.constr)
          end
        when :__skip__
          add_typing(node, type: AST::Builtin.any_type)
        else
          if enforced_type = context.type_env.enforced_type(name)
            case
            when !hint
              hint = enforced_type
            when check_relation(sub_type: enforced_type, super_type: hint).success?
              # enforced_type is compatible with hint and more specific to hint.
              # This typically happens when hint is untyped, top, or void.
              hint = enforced_type
            end
          end

          if rhs
            rhs_type, rhs_constr, rhs_context = synthesize(rhs, hint: hint).to_ary

            constr = rhs_constr.update_type_env do |type_env|
              var_type = rhs_type

              if enforced_type = type_env.enforced_type(name)
                if result = no_subtyping?(sub_type: rhs_type, super_type: enforced_type)
                  typing.add_error(
                    Diagnostic::Ruby::IncompatibleAssignment.new(
                      node: node,
                      lhs_type: enforced_type,
                      rhs_type: rhs_type,
                      result: result
                    )
                  )

                  var_type = enforced_type
                end

                if rhs_type.is_a?(AST::Types::Any)
                  var_type = enforced_type
                end
              end

              type_env.assign_local_variable(name, var_type, enforced_type)
            end

            constr.add_typing(node, type: rhs_type)
          else
            add_typing(node, type: enforced_type || AST::Builtin.any_type)
          end
        end
      end

    when :lvar
      yield_self do
        var = node.children[0]

        if SPECIAL_LVAR_NAMES.include?(var)
          add_typing node, type: AST::Builtin.any_type
        else
          if (type = context.type_env[var])
            add_typing node, type: type
          else
            fallback_to_any(node)
          end
        end
      end

    when :ivasgn
      name = node.children[0]
      rhs = node.children[1]

      rhs_type, constr = synthesize(rhs, hint: context.type_env[name])

      constr.ivasgn(node, rhs_type)

    when :ivar
      yield_self do
        name = node.children[0]

        if type = context.type_env[name]
          add_typing(node, type: type)
        else
          fallback_to_any node
        end
      end

    when :match_with_lvasgn
      each_child_node(node) do |child|
        synthesize(child)
      end
      add_typing(node, type: AST::Builtin.any_type)

    when :op_asgn
      yield_self do
        lhs, op, rhs = node.children

        case lhs.type
        when :lvasgn
          var_node = lhs.updated(:lvar)
          send_node = rhs.updated(:send, [var_node, op, rhs])
          new_node = node.updated(:lvasgn, [lhs.children[0], send_node])

          type, constr = synthesize(new_node, hint: hint)

          constr.add_typing(node, type: type)

        when :ivasgn
          var_node = lhs.updated(:ivar)
          send_node = rhs.updated(:send, [var_node, op, rhs])
          new_node = node.updated(:ivasgn, [lhs.children[0], send_node])

          type, constr = synthesize(new_node, hint: hint)

          constr.add_typing(node, type: type)

        when :cvasgn
          var_node = lhs.updated(:cvar)
          send_node = rhs.updated(:send, [var_node, op, rhs])
          new_node = node.updated(:cvasgn, [lhs.children[0], send_node])

          type, constr = synthesize(new_node, hint: hint)

          constr.add_typing(node, type: type)

        when :gvasgn
          var_node = lhs.updated(:gvar)
          send_node = rhs.updated(:send, [var_node, op, rhs])
          new_node = node.updated(:gvasgn, [lhs.children[0], send_node])

          type, constr = synthesize(new_node, hint: hint)

          constr.add_typing(node, type: type)

        when :send
          new_rhs = rhs.updated(:send, [lhs, node.children[1], node.children[2]])
          new_node = lhs.updated(:send, [lhs.children[0], :"#{lhs.children[1]}=", *lhs.children.drop(2), new_rhs])

          type, constr = synthesize(new_node, hint: hint)

          constr.add_typing(node, type: type)

        else
          Steep.logger.error("Unexpected op_asgn lhs: #{lhs.type}")

          _, constr = synthesize(rhs)
          constr.add_typing(node, type: AST::Builtin.any_type)
        end
      end

    when :super
      yield_self do
        if self_type && method_context!.method
          if super_def = method_context!.super_method
            super_method = Interface::Shape::Entry.new(
              method_name: method_context!.name,
              private_method: true,
              overloads: super_def.defs.map {|type_def|
                type = checker.factory.method_type(type_def.type)
                Interface::Shape::MethodOverload.new(type, [type_def])
              }
            )

            call, constr = type_method_call(
              node,
              receiver_type: self_type,
              method_name: method_context!.name || raise("method context must have a name"),
              method: super_method,
              arguments: node.children,
              block_params: nil,
              block_body: nil,
              tapp: nil,
              hint: hint
            )

            if call && constr
              constr.add_call(call)
            else
              error = Diagnostic::Ruby::UnresolvedOverloading.new(
                node: node,
                receiver_type: self_type,
                method_name: method_context!.name,
                method_types: super_method.method_types
              )
              call = TypeInference::MethodCall::Error.new(
                node: node,
                context: context.call_context,
                method_name: method_context!.name || raise("method context must have a name"),
                receiver_type: self_type,
                errors: [error]
              )

              constr = synthesize_children(node)

              fallback_to_any(node) { error }
            end
          else
            type_check_untyped_args(node.children).fallback_to_any(node) do
              Diagnostic::Ruby::UnexpectedSuper.new(node: node, method: method_context!.name)
            end
          end
        else
          type_check_untyped_args(node.children).fallback_to_any(node)
        end
      end

    when :def
      yield_self do
        # @type var node: Parser::AST::Node & Parser::AST::_DefNode

        name, args_node, body_node = node.children

        with_method_constr(
          name,
          node,
          args: args_node.children,
          self_type: module_context&.instance_type,
          definition: module_context&.instance_definition
        ) do |new|
          # @type var new: TypeConstruction

          new.typing.cursor_context.set_node_context(node, new.context)
          new.typing.cursor_context.set_body_context(node, new.context)

          new.method_context!.tap do |method_context|
            if method_context.method
              if owner = method_context.method.implemented_in || method_context.method.defined_in
                method_name = InstanceMethodName.new(type_name: owner, method_name: name)
                new.typing.source_index.add_definition(method: method_name, definition: node)
              end
            end
          end

          new = new.synthesize_children(args_node)

          body_pair = if body_node
                        return_type = expand_alias(new.method_context!.return_type)
                        if !return_type.is_a?(AST::Types::Void)
                          new.check(body_node, return_type) do |_, actual_type, result|
                            if new.method_context!.attribute_setter?
                              typing.add_error(
                                Diagnostic::Ruby::SetterBodyTypeMismatch.new(
                                  node: node,
                                  expected: new.method_context!.return_type,
                                  actual: actual_type,
                                  result: result,
                                  method_name: new.method_context!.name
                                )
                              )
                            else
                              typing.add_error(
                                Diagnostic::Ruby::MethodBodyTypeMismatch.new(
                                  node: node,
                                  expected: new.method_context!.return_type,
                                  actual: actual_type,
                                  result: result
                                )
                              )
                            end
                          end
                        else
                          new.synthesize(body_node)
                        end
                      else
                        return_type = expand_alias(new.method_context!.return_type)
                        if !return_type.is_a?(AST::Types::Void)
                          result = check_relation(sub_type: AST::Builtin.nil_type, super_type: return_type)
                          if result.failure?
                            if new.method_context!.attribute_setter?
                              typing.add_error(
                                Diagnostic::Ruby::SetterBodyTypeMismatch.new(
                                  node: node,
                                  expected: new.method_context!.return_type,
                                  actual: AST::Builtin.nil_type,
                                  result: result,
                                  method_name: new.method_context!.name
                                )
                              )
                            else
                              typing.add_error(
                                Diagnostic::Ruby::MethodBodyTypeMismatch.new(
                                  node: node,
                                  expected: new.method_context!.return_type,
                                  actual: AST::Builtin.nil_type,
                                  result: result
                                )
                              )
                            end
                          end
                        end

                        Pair.new(type: AST::Builtin.nil_type, constr: new)
                      end

          if body_node
            # Add context to ranges from the end of the method body to the beginning of the `end` keyword
            if node.loc.end
              # Skip end-less def
              begin_pos = body_node.loc.expression.end_pos
              end_pos = node.loc.end.begin_pos
              typing.cursor_context.set(begin_pos..end_pos, body_pair.context)
            end
          end

          if module_context
            module_context.defined_instance_methods << node.children[0]
          end

          add_typing(node, type: AST::Builtin::Symbol.instance_type)
        end
      end

    when :defs
      synthesize(node.children[0]).type.tap do |self_type|
        self_type = expand_self(self_type)
        definition =
          case self_type
          when AST::Types::Name::Instance
            name = self_type.name
            checker.factory.definition_builder.build_instance(name)
          when AST::Types::Name::Singleton
            name = self_type.name
            checker.factory.definition_builder.build_singleton(name)
          end

        args_node = node.children[2]
        new = for_new_method(
          node.children[1],
          node,
          args: args_node.children,
          self_type: self_type,
          definition: definition
        )
        new.typing.cursor_context.set_node_context(node, new.context)
        new.typing.cursor_context.set_body_context(node, new.context)

        new.method_context!.tap do |method_context|
          if method_context.method
            name_ = node.children[1]

            method_name =
              case self_type
              when AST::Types::Name::Instance
                InstanceMethodName.new(type_name: method_context.method.implemented_in || raise, method_name: name_)
              when AST::Types::Name::Singleton
                SingletonMethodName.new(type_name: method_context.method.implemented_in || raise, method_name: name_)
              end

            new.typing.source_index.add_definition(method: method_name, definition: node)
          end
        end

        new = new.synthesize_children(args_node)

        each_child_node(node.children[2]) do |arg|
          new.synthesize(arg)
        end

        if node.children[3]
          return_type = expand_alias(new.method_context!.return_type)
          if !return_type.is_a?(AST::Types::Void)
            new.check(node.children[3], return_type) do |return_type, actual_type, result|
              typing.add_error(
                Diagnostic::Ruby::MethodBodyTypeMismatch.new(
                  node: node,
                  expected: return_type,
                  actual: actual_type,
                  result: result
                )
              )
            end
          else
            new.synthesize(node.children[3])
          end
        end
      end

      if node.children[0].type == :self
        module_context.defined_module_methods << node.children[1]
      end

      add_typing(node, type: AST::Builtin::Symbol.instance_type)

    when :return
      yield_self do
        method_return_type =
          if method_context
            expand_alias(method_context.return_type)
          end

        case node.children.size
        when 0
          value_type = AST::Builtin.nil_type
          constr = self
        when 1
          return_value_node = node.children[0]
          value_type, constr = synthesize(return_value_node, hint: method_return_type)
        else
          # It returns an array
          array = node.updated(:array)
          value_type, constr = synthesize(array, hint: method_return_type)
        end

        if method_return_type
          unless method_context.nil? || method_return_type.is_a?(AST::Types::Void)
            result = constr.check_relation(sub_type: value_type, super_type: method_return_type)

            if result.failure?
              if method_context.attribute_setter?
                typing.add_error(
                  Diagnostic::Ruby::SetterReturnTypeMismatch.new(
                    node: node,
                    method_name: method_context.name,
                    expected: method_return_type,
                    actual: value_type,
                    result: result
                  )
                )
              else
                typing.add_error(
                  Diagnostic::Ruby::ReturnTypeMismatch.new(
                    node: node,
                    expected: method_return_type,
                    actual: value_type,
                    result: result
                  )
                )
              end
            end
          end
        end

        constr.add_typing(node, type: AST::Builtin.bottom_type)
      end

    when :break
      value = node.children[0]

      if break_context
        break_type = break_context.break_type

        if value
          check(value, break_type) do |break_type, actual_type, result|
            typing.add_error(
              Diagnostic::Ruby::BreakTypeMismatch.new(
                node: node,
                expected: break_type,
                actual: actual_type,
                result: result
              )
            )
          end
        else
          unless break_type.is_a?(AST::Types::Bot)
            check_relation(sub_type: AST::Builtin.nil_type, super_type: break_type).else do |result|
              typing.add_error(
                Diagnostic::Ruby::ImplicitBreakValueMismatch.new(
                  node: node,
                  jump_type: break_type,
                  result: result
                )
              )
            end
          end
        end
      else
        synthesize(value) if value
        typing.add_error Diagnostic::Ruby::UnexpectedJump.new(node: node)
      end

      add_typing(node, type: AST::Builtin.bottom_type)

    when :next
      value = node.children[0]

      if break_context
        if next_type = break_context.next_type
          next_type = deep_expand_alias(next_type) || next_type

          if value
            _, constr = check(value, next_type) do |break_type, actual_type, result|
              typing.add_error(
                Diagnostic::Ruby::BreakTypeMismatch.new(
                  node: node,
                  expected: break_type,
                  actual: actual_type,
                  result: result
                )
              )
            end
          else
            check_relation(sub_type: AST::Builtin.nil_type, super_type: next_type).else do |result|
              typing.add_error(
                Diagnostic::Ruby::BreakTypeMismatch.new(
                  node: node,
                  expected: next_type,
                  actual: AST::Builtin.nil_type,
                  result: result
                )
              )
            end
          end
        else
          if value
            synthesize(value)
            typing.add_error Diagnostic::Ruby::UnexpectedJumpValue.new(node: node)
          end
        end
      else
        synthesize(value) if value
        typing.add_error Diagnostic::Ruby::UnexpectedJump.new(node: node)
      end

      add_typing(node, type: AST::Builtin.bottom_type)

    when :retry
      add_typing(node, type: AST::Builtin.bottom_type)

    when :procarg0
      yield_self do
        constr = self #: TypeConstruction

        node.children.each do |arg|
          if arg.is_a?(Symbol)
            if SPECIAL_LVAR_NAMES === arg
              _, constr = add_typing(node, type: AST::Builtin.any_type)
            else
              type = context.type_env[arg]

              if type
                _, constr = add_typing(node, type: type)
              else
                type = AST::Builtin.any_type
                _, constr = lvasgn(node, type)
              end
            end
          else
            _, constr = constr.synthesize(arg)
          end
        end

        Pair.new(constr: constr, type: AST::Builtin.any_type)
      end

    when :mlhs
      yield_self do
        constr = self #: TypeConstruction

        node.children.each do |arg|
          _, constr = constr.synthesize(arg)
        end

        Pair.new(constr: constr, type: AST::Builtin.any_type)
      end

    when :arg, :kwarg
      yield_self do
        var = node.children[0]

        if SPECIAL_LVAR_NAMES.include?(var)
          add_typing(node, type: AST::Builtin.any_type)
        else
          type = context.type_env[var]

          if type
            add_typing(node, type: type)
          else
            type = AST::Builtin.any_type
            lvasgn(node, type)
          end
        end
      end

    when :optarg, :kwoptarg
      yield_self do
        var = node.children[0]
        rhs = node.children[1]

        if SPECIAL_LVAR_NAMES.include?(var)
          synthesize(rhs)
          add_typing(node, type: AST::Builtin.any_type)
        else
          var_type = context.type_env[var]

          if var_type
            type, constr = check(rhs, var_type) do |expected_type, actual_type, result|
              typing.add_error(
                Diagnostic::Ruby::IncompatibleAssignment.new(
                  node: node,
                  lhs_type: expected_type,
                  rhs_type: actual_type,
                  result: result
                )
              )
            end
          else
            type, constr = synthesize(rhs)
          end

          constr.add_typing(node, type: type)
        end
      end

    when :restarg
      yield_self do
        var = node.children[0]

        if !var || SPECIAL_LVAR_NAMES.include?(var)
          return add_typing(node, type: AST::Builtin.any_type)
        end

        type = context.type_env[var]

        unless type
          if context.method_context&.method_type
            Steep.logger.error { "Unknown variable: #{node}" }
          end
          typing.add_error Diagnostic::Ruby::FallbackAny.new(node: node)
          type = AST::Builtin::Array.instance_type(AST::Builtin.any_type)
        end

        add_typing(node, type: type)
      end

    when :kwrestarg
      yield_self do
        var = node.children[0]

        if !var || SPECIAL_LVAR_NAMES.include?(var)
          return add_typing(node, type: AST::Builtin.any_type)
        end

        type = context.type_env[var]
        unless type
          if context.method_context&.method_type
            Steep.logger.error { "Unknown variable: #{node}" }
          end
          typing.add_error Diagnostic::Ruby::FallbackAny.new(node: node)
          type = AST::Builtin::Hash.instance_type(AST::Builtin::Symbol.instance_type, AST::Builtin.any_type)
        end

        add_typing(node, type: type)
      end

    when :float
      add_typing(node, type: AST::Builtin::Float.instance_type)

    when :rational
      add_typing(node, type: AST::Types::Name::Instance.new(name: RBS::TypeName.parse("::Rational"), args: []))

    when :complex
      add_typing(node, type: AST::Types::Name::Instance.new(name: RBS::TypeName.parse("::Complex"), args: []))

    when :nil
      add_typing(node, type: AST::Builtin.nil_type)

    when :int
      yield_self do
        literal_type = test_literal_type(node.children[0], hint)

        if literal_type
          add_typing(node, type: literal_type)
        else
          add_typing(node, type: AST::Builtin::Integer.instance_type)
        end
      end

    when :sym
      yield_self do
        literal_type = test_literal_type(node.children[0], hint)

        if literal_type
          add_typing(node, type: literal_type)
        else
          add_typing(node, type: AST::Builtin::Symbol.instance_type)
        end
      end

    when :str
      yield_self do
        literal_type = test_literal_type(node.children[0], hint)

        if literal_type
          add_typing(node, type: literal_type)
        else
          add_typing(node, type: AST::Builtin::String.instance_type)
        end
      end

    when :true, :false
      ty = node.type == :true ? AST::Types::Literal.new(value: true) : AST::Types::Literal.new(value: false)

      case
      when hint && check_relation(sub_type: ty, super_type: hint).success? && !hint.is_a?(AST::Types::Any) && !hint.is_a?(AST::Types::Top)
        add_typing(node, type: unwrap(hint))
      when condition
        add_typing(node, type: ty)
      else
        add_typing(node, type: AST::Types::Boolean.instance)
      end

    when :hash, :kwargs
      # :kwargs happens for method calls with keyword argument, but the method doesn't have keyword params.
      # Conversion from kwargs to hash happens, and this when-clause is to support it.
      type_hash(node, hint: hint).tap do |pair|
        if pair.type == AST::Builtin::Hash.instance_type(fill_untyped: true)
          case hint
          when AST::Types::Any, AST::Types::Top, AST::Types::Void
            # ok
          else
            unless hint == pair.type
              pair.constr.typing.add_error Diagnostic::Ruby::UnannotatedEmptyCollection.new(node: node)
            end
          end
        end
      end

    when :dstr, :xstr
      each_child_node(node) do |child|
        synthesize(child)
      end

      add_typing(node, type: AST::Builtin::String.instance_type)

    when :dsym
      each_child_node(node) do |child|
        synthesize(child)
      end

      add_typing(node, type: AST::Builtin::Symbol.instance_type)

    when :class
      yield_self do
        constr = self

        # @type var name_node: Parser::AST::Node
        # @type var super_node: Parser::AST::Node?

        name_node, super_node, _ = node.children

        if name_node.type == :const
          _, constr, class_name = synthesize_constant_decl(name_node, name_node.children[0], name_node.children[1]) do
            typing.add_error(
              Diagnostic::Ruby::UnknownConstant.new(node: name_node, name: name_node.children[1]).class!
            )
          end

          if class_name
            check_deprecation_constant(class_name, name_node, name_node.location.expression)
          end
        else
          _, constr = synthesize(name_node)
        end

        if class_name
          typing.source_index.add_definition(constant: class_name, definition: name_node)
        end

        if super_node
          if super_node.type == :const
            _, constr, super_name = constr.synthesize_constant(super_node, super_node.children[0], super_node.children[1]) do
              typing.add_error(
                Diagnostic::Ruby::UnknownConstant.new(node: super_node, name: super_node.children[1]).class!
              )
            end

            if super_name
              typing.source_index.add_reference(constant: super_name, ref: super_node)
            end
          else
            _, constr = synthesize(super_node, hint: nil, condition: false)
          end
        end

        with_class_constr(node, class_name, super_name) do |constructor|
          if module_type = constructor.module_context&.module_type
            _, constructor = constructor.add_typing(name_node, type: module_type)
          else
            _, constructor = constructor.fallback_to_any(name_node)
          end

          constructor.typing.cursor_context.set_node_context(node, constructor.context)
          constructor.typing.cursor_context.set_body_context(node, constructor.context)

          constructor.synthesize(node.children[2]) if node.children[2]

          if constructor.module_context&.implement_name && !namespace_module?(node)
            constructor.validate_method_definitions(node, constructor.module_context.implement_name || raise)
          end
        end

        add_typing(node, type: AST::Builtin.nil_type)
      end

    when :module
      yield_self do
        constr = self

        # @type var name_node: Parser::AST::Node
        name_node, _ = node.children

        if name_node.type == :const
          _, constr, module_name = synthesize_constant_decl(name_node, name_node.children[0], name_node.children[1]) do
            typing.add_error Diagnostic::Ruby::UnknownConstant.new(node: name_node, name: name_node.children[1]).module!
          end

          if module_name
            check_deprecation_constant(module_name, name_node, name_node.location.expression)
          end
        else
          _, constr = synthesize(name_node)
        end

        if module_name
          constr.typing.source_index.add_definition(constant: module_name, definition: name_node)
        end

        with_module_constr(node, module_name) do |constructor|
          if module_type = constructor.module_context&.module_type
            _, constructor = constructor.add_typing(name_node, type: module_type)
          else
            _, constructor = constructor.fallback_to_any(name_node)
          end

          constructor.typing.cursor_context.set_node_context(node, constructor.context)
          constructor.typing.cursor_context.set_body_context(node, constructor.context)

          constructor.synthesize(node.children[1]) if node.children[1]

          if constructor.module_context&.implement_name && !namespace_module?(node)
            constructor.validate_method_definitions(node, constructor.module_context.implement_name || raise)
          end
        end

        add_typing(node, type: AST::Builtin.nil_type)
      end

    when :sclass
      yield_self do
        type, constr = synthesize(node.children[0]).to_ary

        with_sclass_constr(node, type) do |constructor|
          unless constructor
            typing.add_error(
              Diagnostic::Ruby::UnsupportedSyntax.new(
                node: node,
                message: "sclass receiver must be instance type or singleton type, but type given `#{type}`"
              )
            )
            return constr.add_typing(node, type: AST::Builtin.nil_type)
          end

          constructor.typing.cursor_context.set_node_context(node, constructor.context)
          constructor.typing.cursor_context.set_body_context(node, constructor.context)

          constructor.synthesize(node.children[1]) if node.children[1]

          if constructor.module_context.instance_definition && module_context.module_definition
            if constructor.module_context.instance_definition.type_name == module_context.module_definition.type_name
              module_context.defined_module_methods.merge(constructor.module_context.defined_instance_methods)
            end
          end
        end

        constr.add_typing(node, type: AST::Builtin.nil_type)
      end

    when :self
      add_typing node, type: AST::Types::Self.instance

    when :cbase
      add_typing node, type: AST::Types::Void.instance

    when :const
      yield_self do
        type, constr, name = synthesize_constant(node, node.children[0], node.children[1])

        if name
          typing.source_index.add_reference(constant: name, ref: node)
          constr.check_deprecation_constant(name, node, node.location.expression)
        end

        Pair.new(type: type, constr: constr)
      end

    when :casgn
      yield_self do
        constant_type, constr, constant_name = synthesize_constant_decl(nil, node.children[0], node.children[1]) do
          typing.add_error(
            Diagnostic::Ruby::UnknownConstant.new(
              node: node,
              name: node.children[1]
            )
          )
        end

        if constant_name
          typing.source_index.add_definition(constant: constant_name, definition: node)
          location = node.location #: Parser::Source::Map & Parser::AST::_Variable
          constr.check_deprecation_constant(constant_name, node, location.name)
        end

        value_type, constr = constr.synthesize(node.children.last, hint: constant_type)

        result = check_relation(sub_type: value_type, super_type: constant_type)
        if result.failure?
          typing.add_error(
            Diagnostic::Ruby::IncompatibleAssignment.new(
              node: node,
              lhs_type: constant_type,
              rhs_type: value_type,
              result: result
            )
          )

          constr.add_typing(node, type: constant_type)
        else
          constr.add_typing(node, type: value_type)
        end
      end

    when :yield
      if method_context && (method_type = method_context.method_type)
        if block_type = method_context.block_type
          if block_type.type.params
            type = AST::Types::Proc.new(
              type: block_type.type,
              block: nil,
              self_type: block_type.self_type
            )
            args = TypeInference::SendArgs.new(
              node: node,
              arguments: node.children,
              type: type
            )

            # @type var errors: Array[Diagnostic::Ruby::Base]
            errors = []
            constr = type_check_args(
              nil,
              args,
              Subtyping::Constraints.new(unknowns: []),
              errors
            )

            errors.each do |error|
              typing.add_error(error)
            end
          else
            constr = type_check_untyped_args(node.children)
          end

          add_typing(node, type: block_type.type.return_type)
        elsif method_type.type.params
          typing.add_error(Diagnostic::Ruby::UnexpectedYield.new(node: node))
          fallback_to_any node
        else
          constr = type_check_untyped_args(node.children)
          add_typing(node, type: AST::Builtin.any_type)
        end
      else
        fallback_to_any node
      end

    when :zsuper
      yield_self do
        if method_context && method_context.method
          if method_context.super_method
            types = method_context.super_method.method_types.map {|method_type|
              checker.factory.method_type(method_type).type.return_type
            }
            add_typing(node, type: union_type(*types))
          else
            fallback_to_any(node) do
              Diagnostic::Ruby::UnexpectedSuper.new(node: node, method: method_context.name)
            end
          end
        else
          fallback_to_any node
        end
      end

    when :array
      yield_self do
        if node.children.empty?
          if hint
            array = AST::Builtin::Array.instance_type(AST::Builtin.any_type)
            if check_relation(sub_type: array, super_type: hint).success?
              add_typing node, type: unwrap(hint)
            else
              add_typing node, type: array
            end
          else
            typing.add_error Diagnostic::Ruby::UnannotatedEmptyCollection.new(node: node)
            add_typing node, type: AST::Builtin::Array.instance_type(AST::Builtin.any_type)
          end
        else
          if hint
            tuples = select_flatten_types(hint) {|type| type.is_a?(AST::Types::Tuple) } #: Array[AST::Types::Tuple]
            unless tuples.empty?
              fallback_pair = nil #: Pair?
              tuples.each do |tuple|
                typing.new_child() do |child_typing|
                  if pair = with_new_typing(child_typing).try_tuple_type(node, tuple)
                    if pair.constr.check_relation(sub_type: pair.type, super_type: tuple).success?
                      return pair.with(constr: pair.constr.save_typing)
                    end
                    fallback_pair ||= pair.with(constr: pair.constr.save_typing)
                  end
                end
              end
              return fallback_pair if fallback_pair
            end
          end

          if hint
            arrays = select_flatten_types(hint) {|type| AST::Builtin::Array.instance_type?(type) } #: Array[AST::Types::Name::Instance]
            unless arrays.empty?
              arrays.each do |array|
                typing.new_child() do |child_typing|
                  pair = with_new_typing(child_typing).try_array_type(node, array)
                  if pair.constr.check_relation(sub_type: pair.type, super_type: hint).success?
                    return pair.with(constr: pair.constr.save_typing)
                  end
                end
              end
            end
          end

          try_array_type(node, nil)
        end
      end

    when :and
      yield_self do
        left_node, right_node = node.children

        left_type, constr, left_context = synthesize(left_node, hint: hint, condition: true).to_ary

        interpreter = TypeInference::LogicTypeInterpreter.new(subtyping: checker, typing: typing, config: builder_config)
        left_truthy, left_falsy = interpreter.eval(env: left_context.type_env, node: left_node)

        if left_type.is_a?(AST::Types::Logic::Env)
          left_type = left_type.type
        end

        right_type, constr, right_context =
          constr
            .update_type_env { left_truthy.env }
            .tap {|constr| typing.cursor_context.set_node_context(right_node, constr.context) }
            .for_branch(right_node)
            .synthesize(right_node, hint: hint, condition: true).to_ary

        right_truthy, right_falsy = interpreter.eval(env: right_context.type_env, node: right_node)

        case
        when left_truthy.unreachable
          # Always left_falsy
          env = left_falsy.env
          type = left_falsy.type
        when left_falsy.unreachable
          # Always left_truthy ==> right
          env = right_context.type_env
          type = right_type
        when right_truthy.unreachable && right_falsy.unreachable
          env = left_falsy.env
          type = left_falsy.type
        else
          env = context.type_env.join(left_falsy.env, right_context.type_env)
          type = union_type(left_falsy.type, right_type)

          unless type.is_a?(AST::Types::Any)
            if check_relation(sub_type: type, super_type: AST::Types::Boolean.instance).success?
              type = AST::Types::Boolean.instance
            end
          end
        end

        if condition
          type = AST::Types::Logic::Env.new(
            truthy: right_truthy.env,
            falsy: context.type_env.join(left_falsy.env, right_falsy.env),
            type: type
          )
        end

        constr.update_type_env { env }.add_typing(node, type: type)
      end

    when :or
      yield_self do
        left_node, right_node = node.children

        if hint
          left_hint = union_type_unify(hint, AST::Builtin.nil_type, AST::Builtin.false_type)
        end
        left_type, constr, left_context = synthesize(left_node, hint: left_hint, condition: true).to_ary

        interpreter = TypeInference::LogicTypeInterpreter.new(subtyping: checker, typing: typing, config: builder_config)
        left_truthy, left_falsy = interpreter.eval(env: left_context.type_env, node: left_node)

        if left_type.is_a?(AST::Types::Logic::Env)
          left_type = left_type.type
        end

        right_type, constr, right_context =
          constr
            .update_type_env { left_falsy.env }
            .tap {|constr| typing.cursor_context.set_node_context(right_node, constr.context) }
            .for_branch(right_node)
            .synthesize(right_node, hint: left_truthy.type, condition: true).to_ary

        right_truthy, right_falsy = interpreter.eval(env: right_context.type_env, node: right_node)

        case
        when left_falsy.unreachable
          env = left_truthy.env
          type = left_truthy.type
        when left_truthy.unreachable
          # Always left_falsy ==> right
          env = right_context.type_env
          type = right_type
        when right_truthy.unreachable && right_falsy.unreachable
          env = left_truthy.env
          type = left_truthy.type
        else
          env = context.type_env.join(left_truthy.env, right_context.type_env)
          type = union_type(left_truthy.type, right_type)

          unless type.is_a?(AST::Types::Any)
            if check_relation(sub_type: type, super_type: AST::Types::Boolean.instance).success?
              type = AST::Types::Boolean.instance
            end
          end
        end

        if condition
          type = AST::Types::Logic::Env.new(
            truthy: context.type_env.join(left_truthy.env, right_truthy.env),
            falsy: right_falsy.env,
            type: type
          )
        end

        constr.update_type_env { env }.add_typing(node, type: type)
      end

    when :if
      yield_self do
        cond, true_clause, false_clause = node.children

        cond_type, constr = synthesize(cond, condition: true).to_ary
        interpreter = TypeInference::LogicTypeInterpreter.new(subtyping: checker, typing: constr.typing, config: builder_config)
        truthy, falsy = interpreter.eval(env: constr.context.type_env, node: cond)

        if true_clause
          true_pair =
            constr
              .update_type_env { truthy.env }
              .for_branch(true_clause)
              .tap {|constr| typing.cursor_context.set_node_context(true_clause, constr.context) }
              .synthesize(true_clause, hint: hint)
        end

        if false_clause
          false_pair =
            constr
              .update_type_env { falsy.env }
              .for_branch(false_clause)
              .tap {|constr| typing.cursor_context.set_node_context(false_clause, constr.context) }
              .synthesize(false_clause, hint: hint)
        end

        constr = constr.update_type_env do |env|
          envs = [] #: Array[TypeInference::TypeEnv]

          unless truthy.unreachable
            if true_pair
              unless true_pair.type.is_a?(AST::Types::Bot)
                envs << true_pair.context.type_env
              end
            else
              envs << truthy.env
            end
          end

          if false_pair
            unless falsy.unreachable
              unless false_pair.type.is_a?(AST::Types::Bot)
                envs << false_pair.context.type_env
              end
            end
          else
            envs << falsy.env
          end

          env.join(*envs)
        end

        if truthy.unreachable
          if true_clause
            _, _, _, loc = deconstruct_if_node!(node)

            if loc.respond_to?(:keyword)
              condition_loc = loc #: NodeHelper::condition_loc
              case condition_loc.keyword.source
              when "if", "elsif"
                location = condition_loc.begin || condition_loc.keyword
              when "unless"
                # `else` token always exists
                location = condition_loc.else || raise
              end
            else
              location = true_clause.loc.expression
            end

            typing.add_error(
              Diagnostic::Ruby::UnreachableBranch.new(
                node: true_clause,
                location: location || raise
              )
            )
          end
        end

        if falsy.unreachable
          if false_clause
            _, _, _, loc = deconstruct_if_node!(node)

            if loc.respond_to?(:keyword)
              condition_loc = loc #: NodeHelper::condition_loc

              case condition_loc.keyword.source
              when "if", "elsif"
                # `else` token always exists
                location = condition_loc.else || raise
              when "unless"
                location = condition_loc.begin || condition_loc.keyword
              end
            else
              location = false_clause.loc.expression
            end

            typing.add_error(
              Diagnostic::Ruby::UnreachableBranch.new(
                node: false_clause,
                location: location || raise
              )
            )
          end
        end

        node_type = union_type_unify(true_pair&.type || AST::Builtin.nil_type, false_pair&.type || AST::Builtin.nil_type)
        add_typing(node, type: node_type, constr: constr)
      end

    when :case
      yield_self do
        # @type var node: Parser::AST::Node & Parser::AST::_CaseNode

        cond, *whens, els = node.children

        constr = self #: TypeConstruction
        interpreter = TypeInference::LogicTypeInterpreter.new(subtyping: checker, typing: typing, config: builder_config)

        if cond
          types, envs = TypeInference::CaseWhen.type_check(constr, node, interpreter, hint: hint, condition: condition)
        else
          branch_results = [] #: Array[Pair]

          condition_constr = constr

          whens.each do |when_clause|
            when_clause_constr = condition_constr
            body_envs = [] #: Array[TypeInference::TypeEnv]

            # @type var tests: Array[Parser::AST::Node]
            # @type var body: Parser::AST::Node?
            *tests, body = when_clause.children

            branch_reachable = false

            tests.each do |test|
              test_type, condition_constr = condition_constr.synthesize(test, condition: true)
              truthy, falsy = interpreter.eval(env: condition_constr.context.type_env, node: test)
              truthy_env = truthy.env
              falsy_env = falsy.env

              condition_constr = condition_constr.update_type_env { falsy_env }
              body_envs << truthy_env

              branch_reachable ||= !truthy.unreachable
            end

            branch_result =
              if body
                when_clause_constr
                  .update_type_env {|env| env.join(*body_envs) }
                  .for_branch(body)
                  .tap {|constr| typing.cursor_context.set_node_context(body, constr.context) }
                  .synthesize(body, hint: hint)
              else
                Pair.new(type: AST::Builtin.nil_type, constr: when_clause_constr)
              end

            branch_results << branch_result

            unless branch_reachable
              unless branch_result.type.is_a?(AST::Types::Bot)
                typing.add_error(
                  Diagnostic::Ruby::UnreachableValueBranch.new(
                    node: when_clause,
                    type: branch_result.type,
                    location: when_clause.location.keyword || raise
                  )
                )
              end
            end
          end

          if els
            branch_results << condition_constr.synthesize(els, hint: hint)
          else
            branch_results << Pair.new(type: AST::Builtin.nil_type, constr: condition_constr)
          end

          branch_results.reject! do |result|
            result.type.is_a?(AST::Types::Bot)
          end

          types = branch_results.map(&:type)
          envs = branch_results.map {|result| result.constr.context.type_env }
        end

        constr = constr.update_type_env do |env|
          env.join(*envs)
        end

        add_typing(node, type: union_type_unify(*types), constr: constr)
      end

    when :rescue
      yield_self do
        body, *resbodies, else_node = node.children
        body_pair = synthesize(body, hint: hint) if body

        # @type var body_constr: TypeConstruction
        body_constr = if body_pair
                        update_type_env do |env|
                          env.join(env, body_pair.context.type_env)
                        end
                      else
                        self
                      end

        resbody_pairs = resbodies.map do |resbody|
          # @type var exn_classes: Parser::AST::Node
          # @type var assignment: Parser::AST::Node?
          # @type var body: Parser::AST::Node?
          exn_classes, assignment, body = resbody.children

          if exn_classes
            case exn_classes.type
            when :array
              exn_types = exn_classes.children.map {|child| synthesize(child).type }
            else
              Steep.logger.error "Unexpected exception list: #{exn_classes.type}"
            end
          end

          if assignment
            case assignment.type
            when :lvasgn
              var_name = assignment.children[0]
            else
              Steep.logger.error "Unexpected rescue variable assignment: #{assignment.type}"
            end
          end

          resbody_construction = body_constr.for_branch(resbody).update_type_env do |env|
            assignments = {} #: Hash[Symbol, AST::Types::t]

            case
            when exn_classes && var_name && exn_types
              instance_types = exn_types.map do |type|
                type = expand_alias(type)
                case
                when type.is_a?(AST::Types::Name::Singleton)
                  to_instance_type(type)
                else
                  AST::Builtin.any_type
                end
              end

              assignments[var_name] = AST::Types::Union.build(types: instance_types)
            when var_name
              assignments[var_name] = AST::Builtin.any_type
            end

            env.assign_local_variables(assignments)
          end

          if body
            resbody_construction.typing.cursor_context.set_node_context(body, resbody_construction.context)
            resbody_construction.synthesize(body, hint: hint)
          else
            Pair.new(constr: body_constr, type: AST::Builtin.nil_type)
          end
        end

        resbody_pairs.select! do |pair|
          no_subtyping?(sub_type: pair.type, super_type: AST::Types::Bot.instance)
        end

        resbody_types = resbody_pairs.map(&:type)
        resbody_envs = resbody_pairs.map {|pair| pair.context.type_env }

        else_constr = body_pair&.constr || self

        if else_node
          else_type, else_constr = else_constr.for_branch(else_node).synthesize(else_node, hint: hint)
          else_constr
            .update_type_env {|env| env.join(*resbody_envs, env) }
            .add_typing(node, type: union_type(else_type, *resbody_types))
        else
          if resbody_types.empty?
            constr = body_pair ? body_pair.constr : self
            constr.add_typing(node, type: body_pair&.type || AST::Builtin.nil_type)
          else
            update_type_env {|env| env.join(*resbody_envs, else_constr.context.type_env) }
              .add_typing(node, type: union_type(*[body_pair&.type, *resbody_types].compact))
          end
        end
      end

    when :resbody
      yield_self do
        klasses, asgn, body = node.children
        synthesize(klasses) if klasses
        synthesize(asgn) if asgn
        if body
          body_type = synthesize(body, hint: hint).type
          add_typing(node, type: body_type)
        else
          add_typing(node, type: AST::Builtin.nil_type)
        end
      end

    when :ensure
      yield_self do
        body, ensure_body = node.children
        body_type = synthesize(body).type if body
        if ensure_body
          ensure_constr = for_branch(node)
          ensure_constr.synthesize(ensure_body)
        end
        if body_type
          add_typing(node, type: body_type)
        else
          add_typing(node, type: AST::Builtin.nil_type)
        end
      end

    when :masgn
      type_masgn(node)

    when :for
      yield_self do
        asgn, collection, body = node.children

        collection_type, constr, collection_context = synthesize(collection).to_ary
        collection_type = expand_self(collection_type)

        if collection_type.is_a?(AST::Types::Any)
          var_type = AST::Builtin.any_type
        else
          if each = calculate_interface(collection_type, :each, private: true)
            method_type = (each.method_types || []).find do |type|
              if type.block
                if type.block.type.params
                  type.block.type.params.first_param
                else
                  true
                end
              end
            end
            if method_type
              if block = method_type.block
                if first_param = block.type&.params&.first_param
                  var_type = first_param.type #: AST::Types::t
                else
                  var_type = AST::Builtin.any_type
                end
              end
            end
          end
        end
        var_name = asgn.children[0] #: Symbol

        if var_type
          if body
            body_constr = constr.update_type_env do |type_env|
              type_env = type_env.assign_local_variables({ var_name => var_type })
              pins = type_env.pin_local_variables(nil)
              type_env.merge(local_variable_types: pins)
            end

            typing.cursor_context.set_body_context(node, body_constr.context)
            _, _, body_context = body_constr.synthesize(body).to_ary

            constr = constr.update_type_env do |env|
              env.join(collection_context.type_env, body_context.type_env)
            end
          else
            constr = self
          end

          add_typing(node, type: collection_type, constr: constr)
        else
          constr = synthesize_children(node, skips: [collection])

          constr.fallback_to_any(node) do
            Diagnostic::Ruby::NoMethod.new(
              node: node,
              method: :each,
              type: collection_type
            )
          end
        end
      end
    when :while, :until
      yield_self do
        cond, body = node.children
        cond_type, constr = synthesize(cond, condition: true).to_ary

        interpreter = TypeInference::LogicTypeInterpreter.new(subtyping: checker, typing: typing, config: builder_config)
        truthy, falsy = interpreter.eval(env: constr.context.type_env, node: cond)
        truthy_env = truthy.env
        falsy_env = falsy.env

        case node.type
        when :while
          body_env, exit_env = truthy_env, falsy_env
        when :until
          exit_env, body_env = truthy_env, falsy_env
        else
          raise
        end

        body_env or raise
        exit_env or raise


        if body
          pins = body_env.pin_local_variables(nil)
          body_env = body_env.merge(local_variable_types: pins)

          _, body_constr =
            constr
              .update_type_env { body_env }
              .for_branch(body, break_context: TypeInference::Context::BreakContext.new(break_type: hint || AST::Builtin.nil_type, next_type: nil))
              .tap {|constr| typing.cursor_context.set_node_context(body, constr.context) }
              .synthesize(body).to_ary

          constr = constr.update_type_env {|env| env.join(exit_env, body_constr.context.type_env) }
        else
          constr = constr.update_type_env { exit_env }
        end

        add_typing(node, type: AST::Builtin.nil_type, constr: constr)
      end

    when :while_post, :until_post
      yield_self do
        cond, body = node.children

        _, cond_constr, = synthesize(cond)

        if body
          for_loop =
            cond_constr
              .update_type_env {|env| env.merge(local_variable_types: env.pin_local_variables(nil)) }
              .for_branch(body, break_context: TypeInference::Context::BreakContext.new(break_type: hint || AST::Builtin.nil_type, next_type: nil))

          typing.cursor_context.set_node_context(body, for_loop.context)
          _, body_constr, body_context = for_loop.synthesize(body)

          constr = cond_constr.update_type_env {|env| env.join(env, body_context.type_env) }

          add_typing(node, type: AST::Builtin.nil_type, constr: constr)
        else
          add_typing(node, type: AST::Builtin.nil_type, constr: cond_constr)
        end
      end

    when :irange, :erange
      begin_node, end_node = node.children

      constr = self
      begin_type, constr = if begin_node
                             constr.synthesize(begin_node).to_ary
                           else
                             [AST::Builtin.nil_type, constr]
                           end
      end_type, constr = if end_node
                           constr.synthesize(end_node).to_ary
                         else
                           [AST::Builtin.nil_type, constr]
                         end

      type = AST::Builtin::Range.instance_type(union_type(begin_type, end_type))
      add_typing(node, type: type, constr: constr)

    when :regexp
      each_child_node(node) do |child|
        synthesize(child)
      end

      add_typing(node, type: AST::Builtin::Regexp.instance_type)

    when :regopt
      # ignore
      add_typing(node, type: AST::Builtin.any_type)

    when :nth_ref
      add_typing(node, type: union_type(AST::Builtin::String.instance_type, AST::Builtin.nil_type))

    when :back_ref
      synthesize(node.updated(:gvar), hint: hint)

    when :or_asgn, :and_asgn
      yield_self do
        asgn, rhs = node.children

        case asgn.type
        when :lvasgn
          type, constr = synthesize(rhs, hint: hint)
          constr.lvasgn(asgn, type)
        when :ivasgn
          type, constr = synthesize(rhs, hint: hint)
          constr.ivasgn(asgn, type)
        when :gvasgn
          type, constr = synthesize(rhs, hint: hint)
          constr.gvasgn(asgn, type)
        when :send
          children = asgn.children.dup
          children[1] = :"#{children[1]}="
          send_arg_nodes = [*children, rhs]
          rhs_ = node.updated(:send, send_arg_nodes)
          node_type = case node.type
                      when :or_asgn
                        :or
                      when :and_asgn
                        :and
                      end
          node_ = node.updated(node_type, [asgn, rhs_])

          synthesize(node_, hint: hint)
        else
          Steep.logger.error { "#{node.type} with #{asgn.type} lhs is not supported"}
          fallback_to_any(node)
        end
      end

    when :defined?
      type_any_rec(node, only_children: true)
      add_typing(node, type: AST::Builtin.optional(AST::Builtin::String.instance_type))

    when :gvasgn
      yield_self do
        name, rhs = node.children
        lhs_type = context.type_env[name]
        rhs_type, constr = synthesize(rhs, hint: lhs_type).to_ary

        location = node.location #: Parser::Source::Map & Parser::AST::_Variable
        constr.check_deprecation_global(name, node, location.name)

        type, constr = constr.gvasgn(node, rhs_type)

        constr.add_typing(node, type: type)
      end

    when :gvar
      yield_self do
        name = node.children.first

        check_deprecation_global(name, node, node.location.expression)

        if type = context.type_env[name]
          add_typing(node, type: type)
        else
          fallback_to_any(node) do
            Diagnostic::Ruby::UnknownGlobalVariable.new(node: node, name: name)
          end
        end
      end

    when :block_pass
      yield_self do
        value_node = node.children[0]

        constr = self #: TypeConstruction

        if value_node
          type, constr = synthesize(value_node, hint: hint)

          if hint.is_a?(AST::Types::Proc) && value_node.type == :send && value_node.children[1] == :method && AST::Builtin::Method.instance_type?(type)
            receiver_node = value_node.children[0] #: Parser::AST::Node?
            receiver_type = receiver_node ? typing.type_of(node: receiver_node) : self_type
            method_name = value_node.children[2].children[0] #: Symbol
            if method = calculate_interface(receiver_type, private: true)&.methods&.[](method_name)
              if method_type = method.method_types.find {|method_type| method_type.accept_one_arg? }
                if method_type.type_params.empty?
                  type = AST::Types::Proc.new(
                    type: method_type.type,
                    block: method_type.block,
                    self_type: nil
                  )
                end
              end
            end
          elsif hint.is_a?(AST::Types::Proc) && value_node.type == :sym
            if hint.one_arg?
              if hint.type.params
                # Assumes Symbol#to_proc implementation
                param_type = hint.type.params.required.fetch(0)
                case param_type
                when AST::Types::Any
                  type = AST::Types::Any.instance
                else
                  if method = calculate_interface(param_type, private: true)&.methods&.[](value_node.children[0])
                    return_types = method.method_types.filter_map do |method_type|
                      if method_type.type.params.nil? || method_type.type.params.optional?
                        method_type.type.return_type
                      end
                    end

                    unless return_types.empty?
                      type = AST::Types::Proc.new(
                        type: Interface::Function.new(
                          params: Interface::Function::Params.empty.with_first_param(
                            Interface::Function::Params::PositionalParams::Required.new(param_type)
                          ),
                          return_type: return_types.fetch(0),
                          location: nil
                        ),
                        block: nil,
                        self_type: nil
                      )
                    end
                  end
                end
              end
            else
              Steep.logger.error "Passing multiple args through Symbol#to_proc is not supported yet"
            end
          end

          case
          when type.is_a?(AST::Types::Proc)
            # nop
          when AST::Builtin::Proc.instance_type?(type)
            # nop
          else
            type = try_convert(type, :to_proc) || type
          end
        else
          # Anonymous block_pass only happens inside method definition
          if (type = context.type_env[ANONYMOUS_BLOCK_PASSABLE_LVAR])
            # Use type from type_env (may have been narrowed by block_given?)
          elsif block_type = method_context!.block_type
            type = AST::Types::Proc.new(
              type: block_type.type,
              block: nil,
              self_type: block_type.self_type
            )

            if block_type.optional?
              type = union_type(type, AST::Builtin.nil_type)
            end
          else
            type = AST::Builtin.nil_type
          end
        end

        add_typing node, type: type
      end

    when :blockarg
      yield_self do
        each_child_node node do |child|
          synthesize(child)
        end

        add_typing node, type: AST::Builtin.any_type
      end

    when :cvasgn
      name, rhs = node.children

      type, constr = synthesize(rhs, hint: hint)

      var_type =
        if class_vars = module_context.class_variables
          if ty = class_vars[name]
            checker.factory.type(ty)
          end
        end

      if var_type
        result = constr.check_relation(sub_type: type, super_type: var_type)

        if result.success?
          add_typing node, type: type, constr: constr
        else
          fallback_to_any node do
            Diagnostic::Ruby::IncompatibleAssignment.new(
              node: node,
              lhs_type: var_type,
              rhs_type: type,
              result: result
            )
          end
        end
      else
        fallback_to_any(node)
      end

    when :cvar
      name = node.children[0] #: Symbol
      var_type =
        if cvs = module_context.class_variables
          if ty = cvs[name]
            checker.factory.type(ty)
          end
        end

      if var_type
        add_typing node, type: var_type
      else
        fallback_to_any node
      end

    when :alias
      add_typing node, type: AST::Builtin.nil_type

    when :splat
      yield_self do
        typing.add_error(
          Diagnostic::Ruby::UnsupportedSyntax.new(
            node: node,
            message: "Unsupported splat node occurrence"
          )
        )

        each_child_node node do |child|
          synthesize(child)
        end

        add_typing node, type: AST::Builtin.any_type
      end

    when :args
      constr = self #: TypeConstruction

      each_child_node(node) do |child|
        _, constr = constr.synthesize(child)
      end

      add_typing node, type: AST::Builtin.any_type, constr: constr

    when :assertion
      yield_self do
        # @type var as_type: AST::Node::TypeAssertion
        asserted_node, as_type = node.children

        type = as_type.type(module_context.nesting, checker, [])

        case type
        when Array
          type.each do |error|
            typing.add_error(
              Diagnostic::Ruby::RBSError.new(
                error: error,
                node: node,
                location: error.location || raise
              )
            )
          end

          synthesize(asserted_node, hint: hint)

        when nil, RBS::ParsingError
          synthesize(asserted_node, hint: hint)

        else
          actual_type, constr = synthesize(asserted_node, hint: type)

          if no_subtyping?(sub_type: type, super_type: actual_type) && no_subtyping?(sub_type: actual_type, super_type: type)
            typing.add_error(
              Diagnostic::Ruby::FalseAssertion.new(
                node: node,
                assertion_type: type,
                node_type: actual_type
              )
            )
          end

          constr.add_typing(node, type: type)
        end
      end

    when :tapp
      yield_self do
        # @type var tapp: AST::Node::TypeApplication
        sendish, tapp = node.children

        if (array = tapp.types(module_context.nesting, checker, [])).is_a?(Enumerator)
          array.each do |error|
            typing.add_error(
              Diagnostic::Ruby::RBSError.new(
                error: error,
                node: node,
                location: error.location || raise
              )
            )
          end
        end

        type, constr = synthesize_sendish(sendish, hint: hint, tapp: tapp)

        constr.add_typing(node, type: type)
      end

    when :block, :numblock, :send, :csend
      synthesize_sendish(node, hint: hint, tapp: nil)

    when :forwarded_args, :forward_arg
      add_typing(node, type: AST::Builtin.any_type)

    else
      typing.add_error(Diagnostic::Ruby::UnsupportedSyntax.new(node: node))
      add_typing(node, type: AST::Builtin.any_type)

    end.tap do |pair|
      unless pair.is_a?(Pair) && !pair.type.is_a?(Pair)
        # Steep.logger.error { "result = #{pair.inspect}" }
        # Steep.logger.error { "node = #{node.type}" }
        raise "#synthesize should return an instance of Pair: #{pair.class}, node=#{node.inspect}"
      end
    end
  rescue RBS::BaseError => exn
    Steep.logger.warn { "Unexpected RBS error: #{exn.message}" }
    exn.backtrace&.each {|loc| Steep.logger.warn "  #{loc}" }
    typing.add_error(Diagnostic::Ruby::UnexpectedError.new(node: node, error: exn))
    type_any_rec(node)
  rescue StandardError => exn
    Steep.log_error exn
    typing.add_error(Diagnostic::Ruby::UnexpectedError.new(node: node, error: exn))
    type_any_rec(node)
  end
end

    		
  





    
      

  

  
    #synthesize_block(node:, block_type_hint:, block_body:)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 4678

def synthesize_block(node:, block_type_hint:, block_body:)
  if block_body
    body_type, _, context = synthesize(block_body, hint: block_context&.body_type || block_type_hint)

    if annotated_body_type = block_context&.body_type
      if result = no_subtyping?(sub_type: body_type, super_type: annotated_body_type)
        typing.add_error(
          Diagnostic::Ruby::BlockBodyTypeMismatch.new(
            node: node,
            expected: annotated_body_type,
            actual: body_type,
            result: result
          )
        )
      end
      body_type = annotated_body_type
    end

    range = block_body.loc.expression.end_pos..node.loc.end.begin_pos
    typing.cursor_context.set(range, context)

    body_type
  else
    AST::Builtin.nil_type
  end
end

    		
  





    
      

  

  
    #synthesize_children(node, skips: [])  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 3234

def synthesize_children(node, skips: [])
  skips = Set.new.compare_by_identity.merge(skips).delete(nil)

  # @type var constr: TypeConstruction
  constr = self

  each_child_node(node) do |child|
    unless skips.include?(child)
      _, constr = constr.synthesize(child)
    end
  end

  constr
end

    		
  





    
      

  

  
    #synthesize_constant(node, parent_node, constant_name)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 3009

def synthesize_constant(node, parent_node, constant_name)
  const_name = module_name_from_node(parent_node, constant_name)

  if const_name && type = context.type_env.annotated_constant(const_name)
    # const-type annotation wins
    if node
      constr = synthesize_children(node)
      type, constr = constr.add_typing(node, type: type)
      [type, constr, nil]
    else
      [type, self, nil]
    end
  else
    case
    when !parent_node
      constr = self

      if (type, name = context.type_env.constant(constant_name, false))
        if node
          _, constr = add_typing(node, type: type)
        end

        return [type, constr, name]
      end
    when parent_node.type == :cbase
      _, constr = add_typing(parent_node, type: AST::Builtin.nil_type)

      if (type, name = constr.context.type_env.constant(constant_name, true))
        if node
          _, constr = constr.add_typing(node, type: type)
        end

        return [type, constr, name]
      end
    else
      parent_type, constr = synthesize(parent_node).to_ary
      parent_type = expand_self(parent_type)
      parent_type = deep_expand_alias(parent_type)

      case parent_type
      when AST::Types::Name::Singleton
        if (type, name = constr.context.type_env.constant(parent_type.name, constant_name))
          if node
            _, constr = add_typing(node, type: type)
          end

          return [type, constr, name]
        end
      when AST::Types::Any
        # Couldn't detect the type of the parent constant
        # Skip reporting error for this node.
        if node
          _, constr = add_typing(node, type: parent_type)
        end

        return [parent_type, constr, nil]
      end
    end

    if block_given?
      yield
    else
      if node
        constr.typing.add_error(
          Diagnostic::Ruby::UnknownConstant.new(node: node, name: constant_name)
        )
      end
    end

    if node
      _, constr = add_typing(node, type: AST::Builtin.any_type)
    end

    [AST::Builtin.any_type, constr, nil]
  end
end

    		
  





    
      

  

  
    #synthesize_constant_decl(node, parent_node, constant_name, &block)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 2958

def synthesize_constant_decl(node, parent_node, constant_name, &block)
  const_name = module_name_from_node(parent_node, constant_name)

  if const_name && type = context.type_env.annotated_constant(const_name)
    # const-type annotation wins
    if node
      constr = synthesize_children(node)
      type, constr = constr.add_typing(node, type: type)
      [type, constr, nil]
    else
      [type, self, nil]
    end
  else
    if parent_node
      synthesize_constant(node, parent_node, constant_name, &block)
    else
      if nesting
        if parent_nesting = nesting[1]
          if constant = context.type_env.constant_env.resolver.table.children(parent_nesting)&.fetch(constant_name, nil)
            return [checker.factory.type(constant.type), self, constant.name]
          end
        end

        if block_given?
          yield
        else
          if node
            typing.add_error(
              Diagnostic::Ruby::UnknownConstant.new(node: node, name: constant_name)
            )
          end
        end

        constr = self #: TypeConstruction
        if node
          _, constr = add_typing(node, type: AST::Builtin.any_type)
        end

        [
          AST::Builtin.any_type,
          constr,
          nil
        ]
      else
        # No nesting
        synthesize_constant(node, nil, constant_name, &block)
      end
    end
  end
end

    		
  





    
      

  

  
    #synthesize_sendish(node, hint:, tapp:)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 2740

def synthesize_sendish(node, hint:, tapp:)
  case node.type
  when :send
    type_send(node, send_node: node, block_params: nil, block_body: nil, tapp: tapp, hint: hint)
  when :csend
    yield_self do
      send_type, constr =
        type_send(node, send_node: node, block_params: nil, block_body: nil, unwrap: true, tapp: tapp, hint: hint).to_ary

      constr
        .update_type_env { context.type_env.join(constr.context.type_env, context.type_env) }
        .add_typing(node, type: union_type(send_type, AST::Builtin.nil_type))
    end
  when :block
    yield_self do
      send_node, params, body = node.children
      if send_node.type == :lambda
        # @type var node: Parser::AST::Node & Parser::AST::_BlockNode
        type_lambda(node, params_node: params, body_node: body, type_hint: hint)
      else
        type_send(node, send_node: send_node, block_params: params, block_body: body, unwrap: send_node.type == :csend, tapp: tapp, hint: hint)
      end
    end
  when :numblock
    yield_self do
      send_node, max_num, body = node.children

      if max_num == 1
        arg_nodes = [Parser::AST::Node.new(:procarg0, [:_1])]
      else
        arg_nodes = max_num.times.map {|i| Parser::AST::Node.new(:arg, [:"_#{i+1}"]) }
      end

      params = Parser::AST::Node.new(:args, arg_nodes)

      if send_node.type == :lambda
        # @type var node: Parser::AST::Node & Parser::AST::_BlockNode
        type_lambda(node, params_node: params, body_node: body, type_hint: hint)
      else
        type_send(node, send_node: send_node, block_params: params, block_body: body, unwrap: send_node.type == :csend, tapp: tapp, hint: hint)
      end
    end
  else
    raise "Unexpected node is given to `#synthesize_sendish` (#{node.type}, #{node.location.first_line})"
  end
end

    		
  





    
      

  

  
    #test_literal_type(literal, hint)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 4936

def test_literal_type(literal, hint)
  if hint
    case hint
    when AST::Types::Any
      nil
    else
      literal_type = AST::Types::Literal.new(value: literal)
      if check_relation(sub_type: literal_type, super_type: hint).success?
        unwrap(hint)
      end
    end
  end
end

    		
  





    
      

  

  
    #to_instance_type(type, args: nil)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 4950

def to_instance_type(type, args: nil)
  args = args || case type
                 when AST::Types::Name::Singleton
                   decl = checker.factory.env.module_class_entry(type.name, normalized: true) or raise
                   decl.type_params.each.map { AST::Builtin.any_type }
                 else
                   raise "unexpected type to to_instance_type: #{type}"
                 end

  AST::Types::Name::Instance.new(name: type.name, args: args)
end

    		
  





    
      

  

  
    #try_array_type(node, hint)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 5097

def try_array_type(node, hint)
  element_hint = hint ? hint.args[0] : nil

  constr = self #: TypeConstruction
  element_types = [] #: Array[AST::Types::t]

  each_child_node(node) do |child|
    case child.type
    when :splat
      type, constr = constr.synthesize(child.children[0], hint: hint)

      type = try_convert(type, :to_a) || type

      case
      when AST::Builtin::Array.instance_type?(type)
        type.is_a?(AST::Types::Name::Instance) or raise
        element_types << type.args.fetch(0)
      when type.is_a?(AST::Types::Tuple)
        element_types.push(*type.types)
      else
        element_types.push(*flatten_array_elements(type))
      end
    else
      type, constr = constr.synthesize(child, hint: element_hint)
      element_types << type
    end
  end

  element_type = AST::Types::Union.build(types: element_types)
  constr.add_typing(node, type: AST::Builtin::Array.instance_type(element_type))
end

    		
  





    
      

  

  
    #try_convert(type, method)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 5019

def try_convert(type, method)
  if shape = calculate_interface(type, private: false)
    if entry = shape.methods[method]
      method_type = entry.method_types.find do |method_type|
        method_type.type.params.nil? || method_type.type.params.optional?
      end

      method_type.type.return_type if method_type
    end
  end
end

    		
  





    
      

  

  
    #try_convert_to_array(type)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 5031

def try_convert_to_array(type)
  if arrayish = arrayish_type?(type, untyped_is: true) || semantically_arrayish_type?(type)
    arrayish
  else
    if converted = try_convert(type, :to_ary)
      if arrayish_type?(converted, untyped_is: true) || semantically_arrayish_type?(type)
        converted
      end
    else
      AST::Types::Tuple.new(types: [type])
    end
  end
end

    		
  





    
      

  

  
    #try_method_type(node, receiver_type:, method_name:, method_overload:, arguments:, block_params:, block_body:, tapp:, hint:)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 3964

def try_method_type(node, receiver_type:, method_name:, method_overload:, arguments:, block_params:, block_body:, tapp:, hint:)
  constr = self

  method_type = method_overload.method_type
  decls = method_overload.method_decls(method_name).to_set

  if tapp && type_args = tapp.types?(module_context.nesting, checker, [])
    type_arity = method_type.type_params.size
    type_param_names = method_type.type_params.map(&:name)

    # Explicit type application
    if type_args.size == type_arity
      # @type var args_: Array[AST::Types::t]
      args_ = []

      type_args.each_with_index do |type, index|
        param = method_type.type_params.fetch(index)

        if upper_bound = param.upper_bound
          if result = no_subtyping?(sub_type: type.value, super_type: upper_bound)
            args_ << AST::Builtin.any_type
            constr.typing.add_error(
              Diagnostic::Ruby::TypeArgumentMismatchError.new(
                type_arg: type.value,
                type_param: param,
                result: result,
                location: type.location
              )
            )
          else
            args_ << type.value
          end
        else
          args_ << type.value
        end
      end

      method_type = method_type.instantiate(Interface::Substitution.build(type_param_names, args_))
    else
      if type_args.size > type_arity
        type_args.drop(type_arity).each do |type_arg|
          constr.typing.add_error(
            Diagnostic::Ruby::UnexpectedTypeArgument.new(
              type_arg: type_arg.value,
              method_type: method_type,
              location: type_arg.location
            )
          )
        end
      end

      if type_args.size < type_arity
        constr.typing.add_error(
          Diagnostic::Ruby::InsufficientTypeArgument.new(
            node: tapp.node,
            type_args: type_args.map(&:value),
            method_type: method_type
          )
        )
      end

      method_type = method_type.instantiate(
        Interface::Substitution.build(
          type_param_names,
          Array.new(type_param_names.size, AST::Builtin.any_type)
        )
      )
    end

    type_params = [] #: Array[Interface::TypeParam]
    type_param_names.clear
  else
    # Infer type application
    type_params, instantiation = Interface::TypeParam.rename(method_type.type_params)
    type_param_names = type_params.map(&:name)
    method_type = method_type.instantiate(instantiation)
  end

  constr = constr.with(
    context: context.with(
      variable_context: TypeInference::Context::TypeVariableContext.new(
        type_params,
        parent_context: context.variable_context
      )
    )
  )

  variance = Subtyping::VariableVariance.from_method_type(method_type)
  constraints = Subtyping::Constraints.new(unknowns: type_params.map(&:name))
  ccontext = Subtyping::Constraints::Context.new(
    self_type: self_type,
    instance_type: module_context.instance_type,
    class_type: module_context.module_type,
    variance: variance
  )

  upper_bounds = {} #: Hash[Symbol, AST::Types::t]

  type_params.each do |param|
    if ub = param.upper_bound
      constraints.add(param.name, super_type: ub, skip: true)
      upper_bounds[param.name] = ub
    end
  end

  checker.push_variable_bounds(upper_bounds) do
    # @type block: [TypeInference::MethodCall::t, TypeConstruction]

    # @type var errors: Array[Diagnostic::Ruby::Base]
    errors = []

    if method_type.type.params
      args = TypeInference::SendArgs.new(node: node, arguments: arguments, type: method_type)
      constr = constr.type_check_args(
        method_name,
        args,
        constraints,
        errors
      )
    else
      constr = constr.type_check_untyped_args(arguments)
    end

    if block_params
      # block is given

      # @type var node: Parser::AST::Node & Parser::AST::_BlockNode

      block_annotations = source.annotations(block: node, factory: checker.factory, context: nesting)
      block_params_ = TypeInference::BlockParams.from_node(block_params, annotations: block_annotations)

      if method_type.block
        fvs = method_type.type.return_type.free_variables.each.with_object(Set[]) do |var, fvs| #$ Set[Symbol]
          if var.is_a?(Symbol)
            fvs << var
          end
        end

        if hint && !fvs.empty?
          if hint.free_variables.subset?(self_type.free_variables)
            if check_relation(sub_type: method_type.type.return_type, super_type: hint, constraints: constraints).success?
              method_type, solved, s = apply_solution(errors, node: node, method_type: method_type) do
                constraints.solution(checker, variables: fvs, context: ccontext)
              end
            end

            method_type.block or raise
          end
        end

        # Method accepts block
        pairs = block_params_&.zip(method_type.block.type.params, nil, factory: checker.factory)

        if block_params_ && pairs
          # Block parameters are compatible with the block type
          block_constr = constr.for_block(
            block_body,
            block_params: block_params_,
            block_param_hint: method_type.block.type.params,
            block_next_type: method_type.block.type.return_type,
            block_block_hint: nil,
            block_annotations: block_annotations,
            block_self_hint: method_type.block.self_type,
            node_type_hint: method_type.type.return_type
          )

          block_constr = block_constr.with_new_typing(
            block_constr.typing.new_child()
          )

          block_constr.typing.cursor_context.set_body_context(node, block_constr.context)

          pairs.each do |param, type|
            case param
            when TypeInference::BlockParams::Param
              _, block_constr = block_constr.synthesize(param.node, hint: param.type || type)

              if param.type
                check_relation(sub_type: type, super_type: param.type, constraints: constraints).else do |result|
                  error = Diagnostic::Ruby::IncompatibleAssignment.new(
                    node: param.node,
                    lhs_type: param.type,
                    rhs_type: type,
                    result: result
                  )
                  errors << error
                end
              end
            when TypeInference::BlockParams::MultipleParam
              param.each_param do |p|
                _, block_constr = block_constr.synthesize(p.node, hint: p.type || type)

                if p.type
                  check_relation(sub_type: type, super_type: p.type, constraints: constraints).else do |result|
                    error = Diagnostic::Ruby::IncompatibleAssignment.new(
                      node: p.node,
                      lhs_type: p.type,
                      rhs_type: type,
                      result: result
                    )
                    errors << error
                  end
                end
              end

              _, block_constr = block_constr.add_typing(param.node, type: type)
            end
          end

          method_type, solved, s = apply_solution(errors, node: node, method_type: method_type) {
            fvs_ = Set[] #: Set[AST::Types::variable]

            fvs_.merge(method_type.type.params.free_variables) if method_type.type.params
            fvs_.merge(method_type.block.type.params.free_variables) if method_type.block.type.params
            (method_type.type.return_type.free_variables + method_type.block.type.return_type.free_variables).each do |var|
              if var.is_a?(Symbol)
                if constraints.unknown?(var)
                  unless constraints.has_constraint?(var)
                    fvs_.delete(var)
                  end
                end
              end
            end

            constraints.solution(checker, variables: fvs_, context: ccontext)
          }

          method_type.block or raise

          if solved
            # Ready for type check the body of the block
            block_constr = block_constr.update_type_env {|env| env.subst(s) }
            block_constr = block_constr.update_context {|context|
              context.with(
                self_type: context.self_type.subst(s),
                type_env: context.type_env.subst(s),
                block_context: context.block_context&.subst(s),
                break_context: context.break_context&.subst(s)
              )
            }

            block_body_type = block_constr.synthesize_block(
              node: node,
              block_body: block_body,
              block_type_hint: method_type.block.type.return_type
            )

            if method_type.block && method_type.block.self_type
              block_body_type = block_body_type.subst(
                Interface::Substitution.build(
                  [],
                  [],
                  self_type: method_type.block.self_type,
                  module_type: singleton_type(method_type.block.self_type) || AST::Builtin.top_type,
                  instance_type: instance_type(method_type.block.self_type) || AST::Builtin.top_type
                )
              )
            end

            result = check_relation(sub_type: block_body_type,
                                    super_type: method_type.block.type.return_type,
                                    constraints: constraints)

            if result.success?
              # Successfully type checked the body
              method_type, solved, _ = apply_solution(errors, node: node, method_type: method_type) do
                constraints.solution(checker, variables: type_param_names, context: ccontext)
              end
              method_type = eliminate_vars(method_type, type_param_names) unless solved

              return_type = method_type.type.return_type
              if break_type = block_annotations.break_type
                return_type = union_type(break_type, return_type)
              end
            else
              # The block body has incompatible type
              errors << Diagnostic::Ruby::BlockBodyTypeMismatch.new(
                node: node,
                expected: method_type.block.type.return_type,
                actual: block_body_type,
                result: result
              )

              method_type = eliminate_vars(method_type, type_param_names)
              return_type = method_type.type.return_type
            end

            block_constr.typing.save!
          else
            # Failed to infer the type of block parameters
            constr.type_block_without_hint(node: node, block_annotations: block_annotations, block_params: block_params_, block_body: block_body) do |error|
              errors << error
            end

            method_type = eliminate_vars(method_type, type_param_names)
            return_type = method_type.type.return_type
          end
        else
          # Block parameters are unsupported syntax
          errors << Diagnostic::Ruby::UnsupportedSyntax.new(
            node: block_params,
            message: "Unsupported block params pattern, probably masgn?"
          )

          method_type, solved, _ = apply_solution(errors, node: node, method_type: method_type) {
            constraints.solution(checker, variables: type_param_names, context: ccontext)
          }
          method_type = eliminate_vars(method_type, type_param_names) unless solved

          return_type = method_type.type.return_type
        end
      else
        if args
          # Block is given but method doesn't accept
          #
          constr.type_block_without_hint(node: node, block_annotations: block_annotations, block_params: block_params_, block_body: block_body) do |error|
            errors << error
          end

          case node.children[0].type
          when :super, :zsuper
            unless method_context!.super_method
              errors << Diagnostic::Ruby::UnexpectedSuper.new(
                node: node.children[0],
                method: method_name
              )
            end
          else
            errors << Diagnostic::Ruby::UnexpectedBlockGiven.new(
              node: node,
              method_type: method_type
            )
          end

          method_type = eliminate_vars(method_type, type_param_names)
          return_type = method_type.type.return_type
        else
          if block_body
            block_annotations = source.annotations(block: node, factory: checker.factory, context: nesting)
            type_block_without_hint(
              node: node,
              block_annotations: block_annotations,
              block_params: TypeInference::BlockParams.from_node(block_params, annotations: block_annotations),
              block_body: block_body
            )
          end
        end
      end
    else
      # Block syntax is not given
      if args
        arg = args.block_pass_arg

        case
        when forwarded_args_node = args.forwarded_args_node
          case forward_arg_type = method_context!.forward_arg_type
          when nil
            if method_context!.method_type
              raise "Method context must have `forwarded_arg_type` if `...` node appears in it"
            else
              # Skips type checking forwarded argument because the method type is not given
            end
          when true
            # Skip type checking because it's untyped function
          else
            _, block = forward_arg_type

            method_block_type = method_type.block&.to_proc_type || AST::Builtin.nil_type
            forwarded_block_type = block&.to_proc_type || AST::Builtin.nil_type

            if result = constr.no_subtyping?(sub_type: forwarded_block_type, super_type: method_block_type)
              errors << Diagnostic::Ruby::IncompatibleArgumentForwarding.new(
                method_name: method_name,
                node: forwarded_args_node,
                block_pair: [block, method_type.block],
                result: result
              )
            end
          end

        when arg.compatible?
          if arg.node
            # Block pass (&block) is given
            node_type, constr = constr.synthesize(arg.node, hint: arg.node_type)

            nil_given =
              constr.check_relation(sub_type: node_type, super_type: AST::Builtin.nil_type).success? &&
                !node_type.is_a?(AST::Types::Any)

            if nil_given
              # nil is given ==> no block arg node is given
              method_type, solved, _ = apply_solution(errors, node: node, method_type: method_type) {
                constraints.solution(checker, variables: method_type.free_variables, context: ccontext)
              }
              method_type = eliminate_vars(method_type, type_param_names) unless solved

              # Passing no block
              errors << Diagnostic::Ruby::RequiredBlockMissing.new(
                node: node,
                method_type: method_type
              )
            else
              # non-nil value is given
              constr.check_relation(sub_type: node_type, super_type: arg.node_type, constraints: constraints).else do |result|
                errors << Diagnostic::Ruby::BlockTypeMismatch.new(
                  node: arg.node,
                  expected: arg.node_type,
                  actual: node_type,
                  result: result
                )
              end

              method_type, solved, _ = apply_solution(errors, node: node, method_type: method_type) {
                constraints.solution(checker, variables: method_type.free_variables, context: ccontext)
              }
              method_type = eliminate_vars(method_type, type_param_names) unless solved
            end
          else
            # Block is not given
            method_type, solved, _ = apply_solution(errors, node: node, method_type: method_type) {
              constraints.solution(checker, variables: method_type.free_variables, context: ccontext)
            }
            method_type = eliminate_vars(method_type, type_param_names) unless solved
          end

          return_type = method_type.type.return_type

        when arg.block_missing?
          # Block is required but not given
          method_type, solved, _ = apply_solution(errors, node: node, method_type: method_type) {
            constraints.solution(checker, variables: method_type.free_variables, context: ccontext)
          }

          method_type = eliminate_vars(method_type, type_param_names) unless solved
          return_type = method_type.type.return_type

          errors << Diagnostic::Ruby::RequiredBlockMissing.new(
            node: node,
            method_type: method_type
          )

        when arg.unexpected_block?
          # Unexpected block pass node is given

          arg.node or raise

          method_type, solved, _ = apply_solution(errors, node: node, method_type: method_type) {
            constraints.solution(checker, variables: method_type.free_variables, context: ccontext)
          }
          method_type = eliminate_vars(method_type, type_param_names) unless solved
          return_type = method_type.type.return_type

          node_type, constr = constr.synthesize(arg.node)

          unless constr.check_relation(sub_type: node_type, super_type: AST::Builtin.nil_type).success?
            errors << Diagnostic::Ruby::UnexpectedBlockGiven.new(
              node: node,
              method_type: method_type
            )
          end
        end
      end
    end

    call = if errors.empty?
             TypeInference::MethodCall::Typed.new(
               node: node,
               context: context.call_context,
               receiver_type: receiver_type,
               method_name: method_name,
               actual_method_type: method_type,
               return_type: return_type || method_type.type.return_type,
               method_decls: decls
             )
           else
             TypeInference::MethodCall::Error.new(
               node: node,
               context: context.call_context,
               receiver_type: receiver_type,
               method_name: method_name,
               return_type: return_type || method_type.type.return_type,
               method_decls: decls,
               errors: errors
             )
           end

    constr = constr.with(
      context: constr.context.with(
        variable_context: context.variable_context
      )
    )

    [
      call,
      constr
    ]
  end
end

    		
  





    
      

  

  
    #try_special_method(node, receiver_type:, method_name:, method_overload:, arguments:, block_params:, block_body:, hint:)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 3616

def try_special_method(node, receiver_type:, method_name:, method_overload:, arguments:, block_params:, block_body:, hint:)
  method_type = method_overload.method_type
  decls = method_overload.method_decls(method_name).to_set

  case
  when decl = decls.find {|decl| SPECIAL_METHOD_NAMES.fetch(:array_compact).include?(decl.method_name) }
    if arguments.empty? && !block_params
      # compact
      return_type = method_type.type.return_type
      if AST::Builtin::Array.instance_type?(return_type)
        # @type var return_type: AST::Types::Name::Instance
        elem = return_type.args.fetch(0)
        type = AST::Builtin::Array.instance_type(unwrap(elem))

        _, constr = add_typing(node, type: type)
        call = TypeInference::MethodCall::Special.new(
          node: node,
          context: constr.context.call_context,
          method_name: decl.method_name.method_name,
          receiver_type: receiver_type,
          actual_method_type: method_type.with(type: method_type.type.with(return_type: type)),
          return_type: type,
          method_decls: decls
        )

        return [call, constr]
      end
    end
  when decl = decls.find {|decl| SPECIAL_METHOD_NAMES.fetch(:hash_compact).include?(decl.method_name) }
    if arguments.empty? && !block_params
      # compact
      return_type = method_type.type.return_type
      if AST::Builtin::Hash.instance_type?(return_type)
        # @type var return_type: AST::Types::Name::Instance
        key = return_type.args.fetch(0)
        value = return_type.args.fetch(1)
        type = AST::Builtin::Hash.instance_type(key, unwrap(value))

        _, constr = add_typing(node, type: type)
        call = TypeInference::MethodCall::Special.new(
          node: node,
          context: constr.context.call_context,
          method_name: decl.method_name.method_name,
          receiver_type: receiver_type,
          actual_method_type: method_type.with(type: method_type.type.with(return_type: type)),
          return_type: type,
          method_decls: decls
        )

        return [call, constr]
      end
    end
  when decl = decls.find {|decl| SPECIAL_METHOD_NAMES.fetch(:lambda).include?(decl.method_name) }
    if block_params
      # @type var node: Parser::AST::Node & Parser::AST::_BlockNode
      type, constr = type_lambda(node, params_node: block_params, body_node: block_body, type_hint: hint)

      call = TypeInference::MethodCall::Special.new(
        node: node,
        context: context.call_context,
        method_name: decl.method_name.method_name,
        receiver_type: receiver_type,
        actual_method_type: method_type.with(type: method_type.type.with(return_type: type)),
        return_type: type,
        method_decls: decls
      )

      return [call, constr]
    end
  end

  nil
end

    		
  





    
      

  

  
    #try_tuple_type(array_node, hint)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 4985

def try_tuple_type(array_node, hint)
  raise unless array_node.type == :array

  constr = self #: TypeConstruction
  element_types = [] #: Array[AST::Types::t]

  array_node.children.each_with_index do |child, index|
    if child.type == :splat
      type, constr = constr.synthesize(child.children[0])
      typing.add_typing(child, type, nil)
      if converted_type = try_convert(type, :to_a)
        if converted_type.is_a?(AST::Types::Tuple)
          element_types.push(*converted_type.types)
        else
          # The converted_type may be an array, which cannot be used to construct a tuple type
          return
        end
      else
        element_types << type
      end
    else
      child_hint =
        if hint
          hint.types[index]
        end

      type, constr = constr.synthesize(child, hint: child_hint)
      element_types << type
    end
  end

  constr.add_typing(array_node, type: AST::Types::Tuple.new(types: element_types))
end

    		
  





    
      

  

  
    #try_tuple_type!(node, hint: nil)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 4962

def try_tuple_type!(node, hint: nil)
  if node.type == :array
    if node.children.size == 1 && node.children[0]&.type == :splat
      # Skip the array construct
      splat_node = node.children[0] or raise
      splat_value = splat_node.children[0] or raise

      type, constr = try_tuple_type!(splat_value, hint: hint)
      _, constr = constr.add_typing(splat_node, type: AST::Types::Any.instance)
      return constr.add_typing(node, type: type)
    end
    if hint.nil? || hint.is_a?(AST::Types::Tuple)
      typing.new_child() do |child_typing|
        if pair = with_new_typing(child_typing).try_tuple_type(node, hint)
          return pair.with(constr: pair.constr.save_typing)
        end
      end
    end
  end

  synthesize(node, hint: hint)
end

    		
  





    
      

  

  
    #type_any_rec(node, only_children: false)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 4884

def type_any_rec(node, only_children: false)
  add_typing node, type: AST::Builtin.any_type unless only_children

  each_child_node(node) do |child|
    type_any_rec(child)
  end

  Pair.new(type: AST::Builtin.any_type, constr: self)
end

    		
  





    
      

  

  
    #type_block_without_hint(node:, block_annotations:, block_params:, block_body:)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 4474

def type_block_without_hint(node:, block_annotations:, block_params:, block_body:)
  unless block_params
    Diagnostic::Ruby::UnsupportedSyntax.new(
      node: node.children[1],
      message: "Unsupported block params pattern, probably masgn?"
    ).tap do |error|
      if block_given?
        yield error
      else
        typing.add_error(error)
      end
    end

    block_params = TypeInference::BlockParams.new(leading_params: [], optional_params: [], rest_param: nil, trailing_params: [], block_param: nil)
  end

  block_constr = for_block(
    block_body,
    block_params: block_params,
    block_param_hint: nil,
    block_next_type: nil,
    block_block_hint: nil,
    block_annotations: block_annotations,
    block_self_hint: nil,
    node_type_hint: nil
  )

  block_constr.typing.cursor_context.set_body_context(node, block_constr.context)

  block_params.params.each do |param|
    param.each_param do |param|
      _, block_constr = block_constr.synthesize(param.node, hint: param.type)
    end
  end

  block_type = block_constr.synthesize_block(node: node, block_type_hint: nil, block_body: block_body)

  if expected_block_type = block_constr.block_context!.body_type
    block_constr.check_relation(sub_type: block_type, super_type: expected_block_type).else do |result|
      Diagnostic::Ruby::BlockBodyTypeMismatch.new(
        node: node,
        expected: expected_block_type,
        actual: block_type,
        result: result
      ).tap do |error|
        if block_given?
          yield error
        else
          block_constr.typing.add_error(error)
        end
      end
    end
  end
end

    		
  





    
      

  

  
    #type_check_args(method_name, args, constraints, errors)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 3835

def type_check_args(method_name, args, constraints, errors)
  # @type var constr: TypeConstruction
  constr = self

  forwarded_args, es = args.each do |arg|
    case arg
    when TypeInference::SendArgs::PositionalArgs::NodeParamPair
      _, constr = constr.type_check_argument(
        arg.node,
        type: arg.param.type,
        constraints: constraints,
        errors: errors
      )

    when TypeInference::SendArgs::PositionalArgs::NodeTypePair
      _, constr = bypass_splat(arg.node) do |n|
        constr.type_check_argument(
          n,
          type: arg.node_type,
          constraints: constraints,
          report_node: arg.node,
          errors: errors
        )
      end

    when TypeInference::SendArgs::PositionalArgs::UnexpectedArg
      _, constr = bypass_splat(arg.node) do |n|
        constr.synthesize(n)
      end

    when TypeInference::SendArgs::PositionalArgs::SplatArg
      arg_type, _ =
        constr
          .with_child_typing()
          .try_tuple_type!(arg.node.children[0])
      arg.type = arg_type

    when TypeInference::SendArgs::PositionalArgs::MissingArg
      # ignore

    when TypeInference::SendArgs::KeywordArgs::ArgTypePairs
      arg.pairs.each do |pair|
        node, type = pair
        _, constr = bypass_splat(node) do |node|
          constr.type_check_argument(
            node,
            type: type,
            constraints: constraints,
            errors: errors
          )
        end
      end

    when TypeInference::SendArgs::KeywordArgs::UnexpectedKeyword
      if arg.node.type == :pair
        arg.node.children.each do |nn|
          _, constr = constr.synthesize(nn)
        end
      else
        _, constr = bypass_splat(arg.node) do |n|
          constr.synthesize(n)
        end
      end

    when TypeInference::SendArgs::KeywordArgs::SplatArg
      type, _ = bypass_splat(arg.node) do |sp_node|
        if sp_node.type == :hash
          pair = constr.type_hash_record(sp_node, nil) and break pair
        end

        constr.synthesize(sp_node)
      end

      arg.type = type

    when TypeInference::SendArgs::KeywordArgs::MissingKeyword
      # ignore

    else
      raise (_ = arg).inspect
    end
  end

  errors.push(*es)

  if forwarded_args
    method_name or raise "method_name cannot be nil if `forwarded_args` is given, because proc/block doesn't support `...` arg"

    method_context = context.method_context or raise
    forward_arg_type = method_context.forward_arg_type

    case forward_arg_type
    when nil
      if context.method_context.method_type
        raise "Method context must have `forwarded_arg_type` if `...` node appears in it"
      else
        # Skips type checking forwarded argument because the method type is not given
      end
    when true
      # Skip type checking forwarded argument because the method is untyped function
    else
      params, _block = forward_arg_type

      checker.with_context(self_type: self_type, instance_type: context.module_context.instance_type, class_type: context.module_context.module_type, constraints: constraints) do
        result = checker.check_method_params(
          :"... (argument forwarding)",
          Subtyping::Relation.new(
            sub_type: forwarded_args.params,
            super_type: params
          )
        )

        if result.failure?
          errors.push(
            Diagnostic::Ruby::IncompatibleArgumentForwarding.new(
              method_name: method_name,
              node: forwarded_args.node,
              params_pair: [params, forwarded_args.params],
              result: result
            )
          )
        end
      end
    end
  end

  constr
end

    		
  





    
      

  

  
    #type_check_argument(node, type:, constraints:, report_node: node, errors:)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 4463

def type_check_argument(node, type:, constraints:, report_node: node, errors:)
  check(node, type, constraints: constraints) do |expected, actual, result|
    errors << Diagnostic::Ruby::ArgumentTypeMismatch.new(
        node: report_node,
        expected: expected,
        actual: actual,
        result: result
      )
  end
end

    		
  





    
      

  

  
    #type_check_untyped_args(arguments)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 3817

def type_check_untyped_args(arguments)
  constr = self #: TypeConstruction

  arguments.each do |arg|
    case arg.type
    when :splat
      type, constr = constr.synthesize(arg.children[0])
      _, constr = constr.add_typing(arg, type: type)
    when :kwargs
      _, constr = constr.type_hash_record(arg, nil) || constr.type_hash(arg, hint: nil)
    else
      _, constr = constr.synthesize(arg)
    end
  end

  constr
end

    		
  





    
      

  

  
    #type_hash(hash_node, hint:)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 5190

def type_hash(hash_node, hint:)
  if hint
    hint = deep_expand_alias(hint)
  end

  case hint
  when AST::Types::Record
    with_child_typing() do |constr|
      pair = constr.type_hash_record(hash_node, hint)
      if pair
        return pair.with(constr: pair.constr.save_typing)
      end
    end
  when AST::Types::Union
    pair = pick_one_of(hint.types) do |type, constr|
      constr.type_hash(hash_node, hint: type)
    end

    if pair
      return pair
    end
  end

  key_types = [] #: Array[AST::Types::t]
  value_types = [] #: Array[AST::Types::t]

  if hint && AST::Builtin::Hash.instance_type?(hint)
    # @type var hint: AST::Types::Name::Instance
    key_hint, value_hint = hint.args
  end

  hint_hash = AST::Builtin::Hash.instance_type(
    key_hint || AST::Builtin.any_type,
    value_hint || AST::Builtin.any_type
  )

  constr = self #: TypeConstruction

  if hash_node.children.empty?
    key_types << key_hint if key_hint
    value_types << value_hint if value_hint
  else
    hash_node.children.each do |elem|
      case elem.type
      when :pair
        key_node, value_node = elem.children
        key_type, constr = constr.synthesize(key_node, hint: key_hint)
        value_type, constr = constr.synthesize(value_node, hint: value_hint)

        key_types << key_type
        value_types << value_type
      when :kwsplat
        bypass_splat(elem) do |elem_|
          constr.synthesize(elem_, hint: hint_hash).tap do |(type, _)|
            if AST::Builtin::Hash.instance_type?(type)
              # @type var type: AST::Types::Name::Instance
              key_types << type.args.fetch(0)
              value_types << type.args.fetch(1)
            end
          end
        end
      else
        raise
      end
    end
  end

  key_types.reject! {|ty| ty.is_a?(AST::Types::Any) }
  value_types.reject! {|ty| ty.is_a?(AST::Types::Any) }

  key_types << AST::Builtin.any_type if key_types.empty?
  value_types << AST::Builtin.any_type if value_types.empty?

  hash_type = AST::Builtin::Hash.instance_type(
    AST::Types::Union.build(types: key_types),
    AST::Types::Union.build(types: value_types)
  )
  constr.add_typing(hash_node, type: hash_type)
end

    		
  





    
      

  

  
    #type_hash_record(hash_node, record_type)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 5129

def type_hash_record(hash_node, record_type)
  raise unless hash_node.type == :hash || hash_node.type == :kwargs

  constr = self #: TypeConstruction

  if record_type
    hints = record_type.elements.dup
  else
    hints = {} #: Hash[AST::Types::Record::key, AST::Types::t]
  end

  elems = {} #: Hash[AST::Types::Record::key, AST::Types::t]

  each_child_node(hash_node) do |child|
    if child.type == :pair
      case child.children[0].type
      when :sym, :int, :str, :true, :false
        key_node = child.children[0] #: Parser::AST::Node
        value_node = child.children[1] #: Parser::AST::Node

        key =
          case key_node.type
          when :sym, :int, :str
            key_node.children[0]
          when :true
            true
          when :false
            false
          end #: AST::Types::Record::key

        _, constr = constr.synthesize(key_node, hint: AST::Types::Literal.new(value: key))

        value_type, constr = constr.synthesize(value_node, hint: hints[key])

        if hints.key?(key)
          hint_type = hints.fetch(key)
          case
          when value_type.is_a?(AST::Types::Any)
            value_type = hints.fetch(key)
          when hint_type.is_a?(AST::Types::Var)
            value_type = value_type
          end
        else
          typing.add_error(
            Diagnostic::Ruby::UnknownRecordKey.new(key: key, node: key_node)
          )
        end

        elems[key] = value_type
      else
        return
      end
    else
      return
    end
  end

  type = AST::Types::Record.new(elements: elems, required_keys: record_type&.required_keys || Set.new(elems.keys))
  constr.add_typing(hash_node, type: type)
end

    		
  





    
      

  

  
    #type_lambda(node, params_node:, body_node:, type_hint:)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 3098

def type_lambda(node, params_node:, body_node:, type_hint:)
  block_annotations = source.annotations(block: node, factory: checker.factory, context: nesting)
  params = TypeInference::BlockParams.from_node(params_node, annotations: block_annotations)

  if type_hint
    original_hint = type_hint

    type_hint = deep_expand_alias(type_hint) || type_hint

    unless type_hint.is_a?(AST::Types::Any)
      procs = flatten_union(type_hint).select do |type|
        check_relation(sub_type: type, super_type: AST::Builtin::Proc.instance_type).success? &&
          !type.is_a?(AST::Types::Any)
      end

      proc_instances, proc_types = procs.partition {|type| AST::Builtin::Proc.instance_type?(type) }

      case
      when !proc_instances.empty? && proc_types.empty?
        # `::Proc` is given as a hint
      when proc_types.size == 1
        # Proc type is given as a hint
        hint_proc = proc_types[0]  #: AST::Types::Proc
        params_hint = hint_proc.type.params
        return_hint = hint_proc.type.return_type
        block_hint = hint_proc.block
        self_hint = hint_proc.self_type
      else
        typing.add_error(
          Diagnostic::Ruby::ProcHintIgnored.new(hint_type: original_hint, node: node)
        )
      end
    end
  end

  block_constr = for_block(
    body_node,
    block_params: params,
    block_param_hint: params_hint,
    block_next_type: return_hint,
    block_block_hint: block_hint,
    block_annotations: block_annotations,
    block_self_hint: self_hint,
    node_type_hint: nil
  )

  block_constr.typing.cursor_context.set_body_context(node, block_constr.context)

  params.each_single_param do |param|
    _, block_constr = block_constr.synthesize(param.node, hint: param.type)
  end

  block =
    if block_param = params.block_param
      if block_param_type = block_param.type
        case block_param_type
        when AST::Types::Proc
          Interface::Block.new(type: block_param_type.type, optional: false, self_type: block_param_type.self_type)
        else
          if proc_type = optional_proc?(block_param_type)
            Interface::Block.new(type: proc_type.type, optional: true, self_type: proc_type.self_type)
          else
            block_constr.typing.add_error(
              Diagnostic::Ruby::ProcTypeExpected.new(
                node: block_param.node,
                type: block_param_type
              )
            )

            Interface::Block.new(
              type: Interface::Function.new(
                params: Interface::Function::Params.empty,
                return_type: AST::Builtin.any_type,
                location: nil
              ),
              optional: false,
              self_type: nil
            )
          end
        end
      else
        block_hint
      end
    end

  if body_node
    return_type = block_constr.synthesize_block(
      node: node,
      block_body: body_node,
      block_type_hint: return_hint
    )

    return_type = return_type.subst(
      Interface::Substitution.build([], [], self_type: block_constr.self_type)
    )

    if expected_block_type = block_constr.block_context!.body_type
      type_vars = expected_block_type.free_variables.filter_map do |var|
        case var
        when Symbol
          var
        end
      end
      subst = Interface::Substitution.build(type_vars, type_vars.map { AST::Builtin.any_type })
      expected_block_type = expected_block_type.subst(subst)

      check_relation(sub_type: return_type, super_type: expected_block_type).else do |result|
        block_constr.typing.add_error(
          Diagnostic::Ruby::BlockBodyTypeMismatch.new(
            node: node,
            expected: expected_block_type,
            actual: return_type,
            result: result
          )
        )

        return_type = expected_block_type
      end
    end
  else
    return_type = AST::Builtin.any_type
  end

  block_type = AST::Types::Proc.new(
    type: Interface::Function.new(
      params: params_hint || params.params_type,
      return_type: return_type,
      location: nil
    ),
    block: block,
    self_type: block_annotations.self_type || self_hint
  )

  add_typing node, type: block_type
end

    		
  





    
      

  

  
    #type_masgn(node)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 2903

def type_masgn(node)
  lhs, rhs = node.children

  masgn = TypeInference::MultipleAssignment.new()
  hint = masgn.hint_for_mlhs(lhs, context.type_env)

  rhs_type, lhs_constr = try_tuple_type!(rhs, hint: hint).to_ary
  rhs_type = deep_expand_alias(rhs_type) || rhs_type

  falsys, truthys = partition_flatten_types(rhs_type) do |type|
    type.is_a?(AST::Types::Nil) || (type.is_a?(AST::Types::Literal) && type.value == false)
  end

  truthy_rhs_type = union_type_unify(*truthys)
  if truthy_rhs_type.is_a?(AST::Types::Union)
    tup = union_of_tuple_to_tuple_of_union(truthy_rhs_type)
    truthy_rhs_type = tup if tup
  end
  optional = !falsys.empty?

  if truthy_rhs_type.is_a?(AST::Types::Tuple) || AST::Builtin::Array.instance_type?(truthy_rhs_type) || truthy_rhs_type.is_a?(AST::Types::Any)
    constr = lhs_constr.type_masgn_type(lhs, truthy_rhs_type, masgn: masgn, optional: optional)
  else
    ary_type = try_convert(truthy_rhs_type, :to_ary) || try_convert(truthy_rhs_type, :to_a) || AST::Types::Tuple.new(types: [truthy_rhs_type])
    constr = lhs_constr.type_masgn_type(lhs, ary_type, masgn: masgn, optional: optional)
  end

  unless constr
    typing.add_error(
      Diagnostic::Ruby::MultipleAssignmentConversionError.new(
        node: rhs,
        original_type: rhs_type,
        returned_type: ary_type || AST::Builtin.bottom_type
      )
    )

    constr = lhs_constr

    each_descendant_node(lhs) do |node|
      case node.type
      when :lvasgn
        _, constr = constr.lvasgn(node, AST::Builtin.any_type)
      when :ivasgn
        _, constr = constr.ivasgn(node, AST::Builtin.any_type)
      when :gvasgn
        _, constr = constr.gvasgn(node, AST::Builtin.any_type)
      else
        _, constr = constr.add_typing(node, type: AST::Builtin.any_type).to_ary
      end
    end
  end

  constr.add_typing(node, type: truthy_rhs_type)
end

    		
  





    
      

  

  
    #type_masgn_type(mlhs_node, rhs_type, masgn:, optional:)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 2860

def type_masgn_type(mlhs_node, rhs_type, masgn:, optional:)
  # @type var constr: TypeConstruction
  constr = self

  if assignments = masgn.expand(mlhs_node, rhs_type || AST::Builtin.any_type, optional)
    assignments.each do |pair|
      node, type = pair

      if assignments.optional
        type = AST::Builtin.optional(type)
      end

      if node.type == :splat
        asgn_node = node.children[0]
        next unless asgn_node
        var_type = asgn_node.type
      else
        asgn_node = node
        var_type = type
      end

      case asgn_node.type
      when :lvasgn
        _, constr = constr.lvasgn(asgn_node, type)
      when :ivasgn
        _, constr = constr.ivasgn(asgn_node, type)
      when :gvasgn
        _, constr = constr.gvasgn(asgn_node, type)
      when :mlhs
        constr = (constr.type_masgn_type(asgn_node, type, masgn: masgn, optional: optional) or return)
      else
        _, constr = constr.synthesize_children(asgn_node).add_typing(asgn_node, type: AST::Builtin.any_type)
      end

      if node.type == :splat
        _, constr = constr.add_typing(node, type: type)
      end
    end

    constr
  end
end

    		
  





    
      

  

  
    #type_method_call(node, method_name:, receiver_type:, method:, arguments:, block_params:, block_body:, tapp:, hint:)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 3690

def type_method_call(node, method_name:, receiver_type:, method:, arguments:, block_params:, block_body:, tapp:, hint:)
  # @type var fails: Array[[TypeInference::MethodCall::t, TypeConstruction]]
  fails = []

  method.overloads.each do |overload|
    Steep.logger.tagged overload.method_type.to_s do
      typing.new_child() do |child_typing|
        constr = self.with_new_typing(child_typing)

        call, constr = constr.try_special_method(
          node,
          receiver_type: receiver_type,
          method_name: method_name,
          method_overload: overload,
          arguments: arguments,
          block_params: block_params,
          block_body: block_body,
          hint: hint
        ) || constr.try_method_type(
          node,
          receiver_type: receiver_type,
          method_name: method_name,
          method_overload: overload,
          arguments: arguments,
          block_params: block_params,
          block_body: block_body,
          tapp: tapp,
          hint: hint
        )

        if call.is_a?(TypeInference::MethodCall::Typed)
          constr.typing.save!
          return [
            call,
            update_type_env { constr.context.type_env }
          ]
        else
          fails << [call, constr]
        end
      end
    end
  end

  non_arity_errors = fails.reject do |call, _|
    if call.is_a?(TypeInference::MethodCall::Error)
      call.errors.any? do |error|
        error.is_a?(Diagnostic::Ruby::UnexpectedBlockGiven) ||
          error.is_a?(Diagnostic::Ruby::RequiredBlockMissing) ||
          error.is_a?(Diagnostic::Ruby::UnexpectedPositionalArgument) ||
          error.is_a?(Diagnostic::Ruby::InsufficientPositionalArguments) ||
          error.is_a?(Diagnostic::Ruby::UnexpectedKeywordArgument) ||
          error.is_a?(Diagnostic::Ruby::InsufficientKeywordArguments)
      end
    end
  end

  unless non_arity_errors.empty?
    fails = non_arity_errors
  end

  if fails.one?
    call, constr = fails.fetch(0)

    constr.typing.save!

    [
      call,
      update_type_env { constr.context.type_env }
    ]
  else
    nil
  end
end

    		
  





    
      

  

  
    #type_name(type)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 5290

def type_name(type)
  case type
  when AST::Types::Name::Instance, AST::Types::Name::Singleton
    type.name
  when AST::Types::Literal
    type_name(type.back_type)
  when AST::Types::Tuple
    AST::Builtin::Array.module_name
  when AST::Types::Record
    AST::Builtin::Hash.module_name
  when AST::Types::Proc
    AST::Builtin::Proc.module_name
  when AST::Types::Boolean, AST::Types::Logic::Base
    nil
  end
end

    		
  





    
      

  

  
    #type_send(node, send_node:, block_params:, block_body:, unwrap: false, tapp:, hint:)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 3467

def type_send(node, send_node:, block_params:, block_body:, unwrap: false, tapp:, hint:)
  # @type var constr: TypeConstruction
  # @type var receiver: Parser::AST::Node?

  case send_node.type
  when :super, :zsuper
    receiver = nil
    method_name = method_context!.name
    arguments = send_node.children

    if method_name.nil? || method_context!.super_method.nil?
      return fallback_to_any(send_node) do
        Diagnostic::Ruby::UnexpectedSuper.new(
          node: send_node,
          method: method_context&.name
        )
      end
    end

    recv_type = AST::Types::Self.instance
    constr = self
  else
    receiver, method_name, *arguments = send_node.children
    if receiver
      recv_type, constr = synthesize(receiver)
    else
      recv_type = AST::Types::Self.instance
      constr = self
    end
  end

  if unwrap
    recv_type = unwrap(recv_type)
  end

  receiver_type = checker.factory.deep_expand_alias(recv_type)
  private = receiver.nil? || receiver.type == :self

  type, constr =
    case receiver_type
    when nil
      raise

    when AST::Types::Any
      case node.type
      when :block, :numblock
        # @type var node: Parser::AST::Node & Parser::AST::_BlockNode
        block_annotations = source.annotations(block: node, factory: checker.factory, context: nesting)
        block_params or raise

        constr = constr.synthesize_children(node.children[0], skips: [receiver])

        constr.type_block_without_hint(
          node: node,
          block_params: TypeInference::BlockParams.from_node(block_params, annotations: block_annotations),
          block_annotations: block_annotations,
          block_body: block_body
        ) do |error|
          constr.typing.errors << error
        end
      else
        constr = constr.synthesize_children(node, skips: [receiver])
      end

      constr.add_call(
        TypeInference::MethodCall::Untyped.new(
          node: node,
          context: context.call_context,
          method_name: method_name
        )
      )
    else
      if interface = calculate_interface(receiver_type, private: private)
        constr.type_send_interface(
          node,
          interface: interface,
          receiver: receiver,
          receiver_type: receiver_type,
          method_name: method_name,
          arguments: arguments,
          block_params: block_params,
          block_body: block_body,
          tapp: tapp,
          hint: hint
        )
      else
        constr = constr.synthesize_children(node, skips: [receiver])
        constr.add_call(
          TypeInference::MethodCall::NoMethodError.new(
            node: node,
            context: context.call_context,
            method_name: method_name,
            receiver_type: receiver_type,
            error: Diagnostic::Ruby::NoMethod.new(node: node, method: method_name, type: receiver_type)
          )
        )
      end
    end

  Pair.new(type: type, constr: constr)
end

    		
  





    
      

  

  
    #type_send_interface(node, interface:, receiver:, receiver_type:, method_name:, arguments:, block_params:, block_body:, tapp:, hint:)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 3280

def type_send_interface(node, interface:, receiver:, receiver_type:, method_name:, arguments:, block_params:, block_body:, tapp:, hint:)
  method = interface.methods[method_name]

  if method
    call, constr = type_method_call(
      node,
      method: method,
      method_name: method_name,
      arguments: arguments,
      block_params: block_params,
      block_body: block_body,
      receiver_type: receiver_type,
      tapp: tapp,
      hint: hint
    )

    if call && constr
      case method_name.to_s
      when "[]="
        if test_send_node(node) {|_, _, _, loc| !loc.dot }
          last_arg = arguments.last or raise
          if typing.has_type?(last_arg)
            call = call.with_return_type(typing.type_of(node: last_arg))
          end
        end
      when /\w=\Z/
        last_arg = arguments.last or raise
        if typing.has_type?(last_arg)
          call = call.with_return_type(typing.type_of(node: last_arg))
        end
      end

      if call.is_a?(TypeInference::MethodCall::Typed)
        if (pure_call, type = constr.context.type_env.pure_method_calls.fetch(node, nil))
          if type
            call = pure_call.update(node: node, return_type: type)
            constr.add_typing(node, type: call.return_type)
          end
        else
          if pure_send?(call, receiver, arguments)
            constr = constr.update_type_env do |env|
              env.add_pure_call(node, call, call.return_type)
            end
          else
            constr = constr.update_type_env do |env|
              if receiver
                env.invalidate_pure_node(receiver)
              else
                env
              end
            end
          end
        end

        if (_, message = deprecated_send?(call))
          send_node, _ = deconstruct_sendish_and_block_nodes(node)
          send_node or raise
          _, _, _, loc = deconstruct_send_node!(send_node)

          constr.typing.add_error(
            Diagnostic::Ruby::DeprecatedReference.new(
              node: node,
              location: loc.selector,
              message: message
            )
          )
        end
      end

      if node.type == :csend || ((node.type == :block || node.type == :numblock) && node.children[0].type == :csend)
        optional_type = AST::Types::Union.build(types: [call.return_type, AST::Builtin.nil_type])
        call = call.with_return_type(optional_type)
      end
    else
      errors = [] #: Array[Diagnostic::Ruby::Base]

      skips = [receiver]
      skips << node.children[0] if node.type == :block

      constr = synthesize_children(node, skips: skips)
      if block_params
        # @type var node: Parser::AST::Node & Parser::AST::_BlockNode
        block_annotations = source.annotations(block: node, factory: checker.factory, context: nesting)

        constr.type_block_without_hint(
          node: node,
          block_params: TypeInference::BlockParams.from_node(block_params, annotations: block_annotations),
          block_annotations: block_annotations,
          block_body: block_body
        ) do |error|
          errors << error
        end
      end

      errors << Diagnostic::Ruby::UnresolvedOverloading.new(
        node: node,
        receiver_type: interface.type,
        method_name: method_name,
        method_types: method.method_types
      )

      decls =  method.overloads.flat_map do |method_overload|
        method_overload.method_decls(method_name)
      end.to_set

      call = TypeInference::MethodCall::Error.new(
        node: node,
        context: context.call_context,
        method_name: method_name,
        receiver_type: receiver_type,
        errors: errors,
        method_decls: decls
      )
    end

    # Handle block_given? type narrowing
    if method_name == :block_given? && call.is_a?(TypeInference::MethodCall::Typed)
      if call.method_decls.all? { _1.method_name == KERNEL_BLOCK_GIVEN }
        if (block_var = constr.method_context&.block_param_name)
          if (var_type = constr.context.type_env[block_var])
            unwrapped = constr.checker.factory.unwrap_optional(var_type)

            if unwrapped
              truthy_env = constr.context.type_env.refine_types(
                local_variable_types: { block_var => unwrapped }
              )
              falsy_env = constr.context.type_env.refine_types(
                local_variable_types: { block_var => AST::Builtin.nil_type }
              )

              env_type = AST::Types::Logic::Env.new(
                truthy: truthy_env,
                falsy: falsy_env,
                type: call.return_type
              )

              call = call.with_return_type(env_type)
            end
          end
        end
      end
    end

    constr.add_call(call)
  else
    skips = [] #: Array[Parser::AST::Node?]
    skips << receiver if receiver
    skips << node.children[0] if node.type == :block
    skips << block_params if block_params
    skips << block_body if block_body

    constr = synthesize_children(node, skips: skips)
    if block_params
      # @type var node: Parser::AST::Node & Parser::AST::_BlockNode
      block_annotations = source.annotations(block: node, factory: checker.factory, context: nesting)

      constr.type_block_without_hint(
        node: node,
        block_params: TypeInference::BlockParams.from_node(block_params, annotations: block_annotations),
        block_annotations: block_annotations,
        block_body: block_body
      )
    end

    if node.type == :block
      send_node = node.children[0]
      case send_node.type
      when :super, :zsuper
        method_name = method_context!.name or raise
        return fallback_to_any(send_node) do
          Diagnostic::Ruby::UnexpectedSuper.new(node: send_node, method: method_name)
        end
      end
    end

    constr.add_call(
      TypeInference::MethodCall::NoMethodError.new(
        node: node,
        context: context.call_context,
        method_name: method_name,
        receiver_type: receiver_type,
        error: Diagnostic::Ruby::NoMethod.new(node: node, method: method_name, type: interface&.type || receiver_type)
      )
    )
  end
end

    		
  





    
      

  

  
    #union_of_tuple_to_tuple_of_union(type)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 4743

def union_of_tuple_to_tuple_of_union(type)
  if type.types.all? {|ty| ty.is_a?(AST::Types::Tuple) }
    # @type var tuples: Array[AST::Types::Tuple]
    tuples = _ = type.types

    max = tuples.map {|tup| tup.types.size }.max or raise

    # @type var tuple_types_array: Array[Array[AST::Types::t]]
    tuple_types_array = tuples.map do |tup|
      if tup.types.size == max
        tup.types
      else
        tup.types + Array.new(max - tup.types.size, AST::Builtin.nil_type)
      end
    end

    # @type var tuple_elems_array: Array[Array[AST::Types::t]]
    tuple_elems_array = tuple_types_array.transpose
    AST::Types::Tuple.new(
      types: tuple_elems_array.map {|types| union_type_unify(*types) }
    )
  end
end

    		
  





    
      

  

  
    #union_type(*types)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 4713

def union_type(*types)
  raise if types.empty?
  AST::Types::Union.build(types: types.compact)
end

    		
  





    
      

  

  
    #union_type_unify(*types)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 4718

def union_type_unify(*types)
  types = types.reject {|t| t.is_a?(AST::Types::Bot) }

  if types.empty?
    AST::Types::Bot.instance
  else
    types.inject do |type1, type2|
      next type2 if type1.is_a?(AST::Types::Any)
      next type1 if type2.is_a?(AST::Types::Any)

      unless no_subtyping?(sub_type: type1, super_type: type2)
        # type1 <: type2
        next type2
      end

      unless no_subtyping?(sub_type: type2, super_type: type1)
        # type2 <: type1
        next type1
      end

      union_type(type1, type2)
    end
  end
end

    		
  





    
      

  

  
    #unwrap(type)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 4894

def unwrap(type)
  checker.factory.unwrap_optional(type) || AST::Types::Bot.instance
end

    		
  





    
      

  

  
    #update_context  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 127

def update_context()
  with(context: yield(self.context))
end

    		
  





    
      

  

  
    #update_type_env  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 131

def update_type_env
  with_updated_context(type_env: yield(context.type_env))
end

    		
  





    
      

  

  
    #validate_method_definitions(node, module_name)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 4767

def validate_method_definitions(node, module_name)
  module_name_1 = module_name.name
  module_entry = checker.factory.env.module_class_entry(module_name_1, normalized: true) or raise
  member_decl_count = module_entry.each_decl.count do |decl|
    case decl
    when RBS::AST::Declarations::Base
      decl.each_member.count > 0
    else
      false
    end
  end

  return unless member_decl_count == 1

  expected_instance_method_names = (module_context.instance_definition&.methods || {}).each.with_object(Set[]) do |(name, method), set|
    if method.implemented_in
      if method.implemented_in == module_context.instance_definition&.type_name
        set << name
      end
    end
  end
  expected_module_method_names = (module_context.module_definition&.methods || {}).each.with_object(Set[]) do |(name, method), set|
    if name != :new
      if method.implemented_in
        if method.implemented_in == module_context.module_definition&.type_name
          set << name
        end
      end
    end
  end

  expected_instance_method_names.each do |method_name|
    case
    when module_context.defined_instance_methods.include?(method_name)
      # ok
    when annotations.instance_dynamics.include?(method_name)
      # ok
    else
      if module_name.name == module_context&.class_name
        typing.add_error(
          Diagnostic::Ruby::MethodDefinitionMissing.new(
            node: node,
            module_name: module_name.name,
            kind: :instance,
            missing_method: method_name
          )
        )
      end
    end
  end
  expected_module_method_names.each do |method_name|
    case
    when module_context.defined_module_methods.include?(method_name)
      # ok
    when annotations.module_dynamics.include?(method_name)
      # ok
    else
      if module_name.name == module_context&.class_name
        typing.add_error(
          Diagnostic::Ruby::MethodDefinitionMissing.new(node: node,
                                                        module_name: module_name.name,
                                                        kind: :module,
                                                        missing_method: method_name)
        )
      end
    end
  end

  annotations.instance_dynamics.each do |method_name|
    unless expected_instance_method_names.member?(method_name)
      typing.add_error(
        Diagnostic::Ruby::UnexpectedDynamicMethod.new(node: node,
                                                      module_name: module_name.name,
                                                      method_name: method_name)
      )
    end
  end
  annotations.module_dynamics.each do |method_name|
    unless expected_module_method_names.member?(method_name)
      typing.add_error(
        Diagnostic::Ruby::UnexpectedDynamicMethod.new(node: node,
                                                      module_name: module_name.name,
                                                      method_name: method_name)
      )
    end
  end
end

    		
  





    
      

  

  
    #variable_context  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 83

def variable_context
  context.variable_context
end

    		
  





    
      

  

  
    #with(annotations: self.annotations, context: self.context, typing: self.typing)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 113

def with(annotations: self.annotations, context: self.context, typing: self.typing)
  if context != self.context || typing != self.typing
    self.class.new(
      checker: checker,
      source: source,
      annotations: annotations,
      typing: typing,
      context: context
    )
  else
    self
  end
end

    		
  





    
      

  

  
    #with_child_typing  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 3764

def with_child_typing()
  constr = with_new_typing(typing.new_child())

  if block_given?
    yield constr
  else
    constr
  end
end

    		
  





    
      

  

  
    #with_class_constr(node, new_class_name, super_class_name)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 572

def with_class_constr(node, new_class_name, super_class_name)
  constr = for_class(node, new_class_name, super_class_name)

  constr.checker.push_variable_bounds(constr.variable_context.upper_bounds) do
    yield constr
  end
end

    		
  





    
      

  

  
    #with_method_constr(method_name, node, args:, self_type:, definition:)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 302

def with_method_constr(method_name, node, args:, self_type:, definition:)
  constr = for_new_method(method_name, node, args: args, self_type: self_type, definition: definition)
  constr.checker.push_variable_bounds(constr.variable_context.upper_bounds) do
    yield constr
  end
end

    		
  





    
      

  

  
    #with_module_constr(node, module_name)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 481

def with_module_constr(node, module_name)
  constr = for_module(node, module_name)
  constr.checker.push_variable_bounds(constr.variable_context.upper_bounds) do
    yield constr
  end
end

    		
  





    
      

  

  
    #with_new_typing(typing)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 95

def with_new_typing(typing)
  self.class.new(
    checker: checker,
    source: source,
    annotations: annotations,
    typing: typing,
    context: context
  )
end

    		
  





    
      

  

  
    #with_sclass_constr(node, type)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 580

def with_sclass_constr(node, type)
  if constr = for_sclass(node, type)
    constr.checker.push_variable_bounds(constr.variable_context.upper_bounds) do
      yield constr
    end
  else
    yield nil
  end
end

    		
  





    
      

  

  
    #with_updated_context(type_env: self.context.type_env)  ⇒ Object 
  

  

  


  

    
      


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# File 'lib/steep/type_construction.rb', line 105

def with_updated_context(type_env: self.context.type_env)
  unless type_env.equal?(self.context.type_env)
    with(context: self.context.with(type_env: type_env))
  else
    self
  end
end