Class: RBS::DefinitionBuilder

Inherits:
Object
  • Object
show all
Defined in:
lib/rbs/definition_builder.rb,
lib/rbs/definition_builder/method_builder.rb,
lib/rbs/definition_builder/ancestor_builder.rb

Defined Under Namespace

Classes: AncestorBuilder, MethodBuilder

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(env:, ancestor_builder: nil, method_builder: nil) ⇒ DefinitionBuilder

Returns a new instance of DefinitionBuilder.



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# File 'lib/rbs/definition_builder.rb', line 13

def initialize(env:, ancestor_builder: nil, method_builder: nil)
  @env = env
  @type_name_resolver = TypeNameResolver.from_env(env)
  @ancestor_builder = ancestor_builder || AncestorBuilder.new(env: env)
  @method_builder = method_builder || MethodBuilder.new(env: env)

  @instance_cache = {}
  @singleton_cache = {}
  @singleton0_cache = {}
  @interface_cache = {}
end

Instance Attribute Details

#ancestor_builder ⇒ Object (readonly)

Returns the value of attribute ancestor_builder.



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# File 'lib/rbs/definition_builder.rb', line 5

def ancestor_builder
  @ancestor_builder
end

#env ⇒ Object (readonly)

Returns the value of attribute env.



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# File 'lib/rbs/definition_builder.rb', line 3

def env
  @env
end

#instance_cache ⇒ Object (readonly)

Returns the value of attribute instance_cache.



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# File 'lib/rbs/definition_builder.rb', line 8

def instance_cache
  @instance_cache
end

#interface_cache ⇒ Object (readonly)

Returns the value of attribute interface_cache.



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# File 'lib/rbs/definition_builder.rb', line 11

def interface_cache
  @interface_cache
end

#method_builder ⇒ Object (readonly)

Returns the value of attribute method_builder.



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# File 'lib/rbs/definition_builder.rb', line 6

def method_builder
  @method_builder
end

#singleton0_cache ⇒ Object (readonly)

Returns the value of attribute singleton0_cache.



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# File 'lib/rbs/definition_builder.rb', line 10

def singleton0_cache
  @singleton0_cache
end

#singleton_cache ⇒ Object (readonly)

Returns the value of attribute singleton_cache.



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# File 'lib/rbs/definition_builder.rb', line 9

def singleton_cache
  @singleton_cache
end

#type_name_resolver ⇒ Object (readonly)

Returns the value of attribute type_name_resolver.



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# File 'lib/rbs/definition_builder.rb', line 4

def type_name_resolver
  @type_name_resolver
end

Instance Method Details

#build_instance(type_name, no_self_types: false) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 135

def build_instance(type_name, no_self_types: false)
  try_cache(type_name, cache: instance_cache, key: [type_name, no_self_types]) do
    entry = env.class_decls[type_name] or raise "Unknown name for build_instance: #{type_name}"
    ensure_namespace!(type_name.namespace, location: entry.decls[0].decl.location)

    case entry
    when Environment::ClassEntry, Environment::ModuleEntry
      ancestors = ancestor_builder.instance_ancestors(type_name)
      args = Types::Variable.build(entry.type_params.each.map(&:name))
      self_type = Types::ClassInstance.new(name: type_name, args: args, location: nil)

      Definition.new(type_name: type_name, entry: entry, self_type: self_type, ancestors: ancestors).tap do |definition|
        one_ancestors = ancestor_builder.one_instance_ancestors(type_name)
        methods = method_builder.build_instance(type_name)

        validate_type_params definition, methods: methods, ancestors: one_ancestors

        if super_class = one_ancestors.super_class
          case super_class
          when Definition::Ancestor::Instance
            build_instance(super_class.name).yield_self do |defn|
              merge_definition(src: defn,
                              dest: definition,
                              subst: Substitution.build(defn.type_params, super_class.args),
                              keep_super: true)
            end
          else
            raise
          end
        end

        if self_types = one_ancestors.self_types
          unless no_self_types
            self_types.each do |ans|
              defn = if ans.name.interface?
                       build_interface(ans.name)
                     else
                       build_instance(ans.name)
                     end

              # Successor interface method overwrites.
              merge_definition(src: defn,
                               dest: definition,
                               subst: Substitution.build(defn.type_params, ans.args),
                               keep_super: true)
            end
          end
        end

        one_ancestors.each_included_module do |mod|
          defn = build_instance(mod.name, no_self_types: true)
          merge_definition(src: defn,
                           dest: definition,
                           subst: Substitution.build(defn.type_params, mod.args))
        end

        interface_methods = {}

        one_ancestors.each_included_interface do |mod|
          defn = build_interface(mod.name)
          subst = Substitution.build(defn.type_params, mod.args)

          defn.methods.each do |name, method|
            if interface_methods.key?(name)
              include_member = mod.source

              raise unless include_member.is_a?(AST::Members::Include)

              raise DuplicatedInterfaceMethodDefinitionError.new(
                type: self_type,
                method_name: name,
                member: include_member
              )
            end

            merge_method(type_name, interface_methods, name, method, subst, implemented_in: type_name)
          end
        end

        define_methods(definition,
                       interface_methods: interface_methods,
                       methods: methods,
                       super_interface_method: entry.is_a?(Environment::ModuleEntry))

        entry.decls.each do |d|
          subst = Substitution.build(d.decl.type_params.each.map(&:name), args)

          d.decl.members.each do |member|
            case member
            when AST::Members::AttrReader, AST::Members::AttrAccessor, AST::Members::AttrWriter
              if member.kind == :instance
                ivar_name = case member.ivar_name
                            when false
                              nil
                            else
                              member.ivar_name || :"@#{member.name}"
                            end

                if ivar_name
                  insert_variable(type_name,
                                  definition.instance_variables,
                                  name: ivar_name,
                                  type: member.type.sub(subst))
                end
              end

            when AST::Members::InstanceVariable
              insert_variable(type_name,
                              definition.instance_variables,
                              name: member.name,
                              type: member.type.sub(subst))

            when AST::Members::ClassVariable
              insert_variable(type_name, definition.class_variables, name: member.name, type: member.type)
            end
          end
        end

        one_ancestors.each_prepended_module do |mod|
          defn = build_instance(mod.name)
          merge_definition(src: defn,
                           dest: definition,
                           subst: Substitution.build(defn.type_params, mod.args))
        end
      end
    end
  end
end

#build_interface(type_name) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 33

def build_interface(type_name)
  try_cache(type_name, cache: interface_cache) do
    entry = env.interface_decls[type_name] or raise "Unknown name for build_interface: #{type_name}"
    declaration = entry.decl
    ensure_namespace!(type_name.namespace, location: declaration.location)

    self_type = Types::Interface.new(
      name: type_name,
      args: Types::Variable.build(declaration.type_params.each.map(&:name)),
      location: nil
    )

    ancestors = ancestor_builder.interface_ancestors(type_name)
    Definition.new(type_name: type_name, entry: entry, self_type: self_type, ancestors: ancestors).tap do |definition|
      included_interfaces = ancestor_builder.one_interface_ancestors(type_name).included_interfaces or raise
      included_interfaces.each do |mod|
        defn = build_interface(mod.name)
        subst = Substitution.build(defn.type_params, mod.args)

        defn.methods.each do |name, method|
          definition.methods[name] = method.sub(subst)
        end
      end

      methods = method_builder.build_interface(type_name)
      one_ancestors = ancestor_builder.one_interface_ancestors(type_name)

      validate_type_params(definition, methods: methods, ancestors: one_ancestors)

      methods.each do |defn|
        method = case original = defn.original
                 when AST::Members::MethodDefinition
                   defs = original.types.map do |method_type|
                     Definition::Method::TypeDef.new(
                       type: method_type,
                       member: original,
                       defined_in: type_name,
                       implemented_in: nil
                     )
                   end

                   Definition::Method.new(
                     super_method: nil,
                     defs: defs,
                     accessibility: :public,
                     alias_of: nil
                   )
                 when AST::Members::Alias
                   unless definition.methods.key?(original.old_name)
                     raise UnknownMethodAliasError.new(
                       type_name: type_name,
                       original_name: original.old_name,
                       aliased_name: original.new_name,
                       location: original.location
                     )
                   end

                   original_method = definition.methods[original.old_name]
                   Definition::Method.new(
                     super_method: nil,
                     defs: original_method.defs.map do |defn|
                       defn.update(implemented_in: nil, defined_in: type_name)
                     end,
                     accessibility: :public,
                     alias_of: original_method
                   )
                 when nil
                   unless definition.methods.key?(defn.name)
                     raise InvalidOverloadMethodError.new(
                       type_name: type_name,
                       method_name: defn.name,
                       kind: :instance,
                       members: defn.overloads
                     )
                   end

                   definition.methods[defn.name]

                 when AST::Members::AttrReader, AST::Members::AttrWriter, AST::Members::AttrAccessor
                   raise

                 end

        defn.overloads.each do |overload|
          overload_defs = overload.types.map do |method_type|
            Definition::Method::TypeDef.new(
              type: method_type,
              member: overload,
              defined_in: type_name,
              implemented_in: nil
            )
          end

          method.defs.unshift(*overload_defs)
        end

        definition.methods[defn.name] = method
      end
    end
  end
end

#build_singleton(type_name) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 355

def build_singleton(type_name)
  try_cache type_name, cache: singleton_cache do
    entry = env.class_decls[type_name] or raise "Unknown name for build_singleton: #{type_name}"
    ensure_namespace!(type_name.namespace, location: entry.decls[0].decl.location)

    case entry
    when Environment::ClassEntry, Environment::ModuleEntry
      ancestors = ancestor_builder.singleton_ancestors(type_name)
      self_type = Types::ClassSingleton.new(name: type_name, location: nil)

      Definition.new(type_name: type_name, entry: entry, self_type: self_type, ancestors: ancestors).tap do |definition|
        def0 = build_singleton0(type_name)
        subst = Substitution.new

        merge_definition(src: def0, dest: definition, subst: subst, keep_super: true)

        if entry.is_a?(Environment::ClassEntry)
          new_method = definition.methods[:new]
          if new_method.defs.all? {|d| d.defined_in == BuiltinNames::Class.name }
            # The method is _untyped new_.

            instance = build_instance(type_name)
            initialize = instance.methods[:initialize]

            if initialize
              class_params = entry.type_params.each.map(&:name)

              # Inject a virtual _typed new_.
              initialize_defs = initialize.defs
              definition.methods[:new] = Definition::Method.new(
                super_method: new_method,
                defs: initialize_defs.map do |initialize_def|
                  method_type = initialize_def.type

                  class_type_param_vars = Set.new(class_params)
                  method_type_param_vars = Set.new(method_type.type_params)

                  if class_type_param_vars.intersect?(method_type_param_vars)
                    renamed_method_params = method_type.type_params.map do |name|
                      if class_type_param_vars.include?(name)
                        Types::Variable.fresh(name).name
                      else
                        name
                      end
                    end
                    method_params = class_params + renamed_method_params

                    sub = Substitution.build(method_type.type_params, Types::Variable.build(renamed_method_params))
                  else
                    method_params = class_params + method_type.type_params
                    sub = Substitution.build([], [])
                  end

                  method_type = method_type.map_type {|ty| ty.sub(sub) }
                  method_type = method_type.update(
                    type_params: method_params,
                    type: method_type.type.with_return_type(
                      Types::ClassInstance.new(
                        name: type_name,
                        args: Types::Variable.build(entry.type_params.each.map(&:name)),
                        location: nil
                      )
                    )
                  )

                  Definition::Method::TypeDef.new(
                    type: method_type,
                    member: initialize_def.member,
                    defined_in: initialize_def.defined_in,
                    implemented_in: initialize_def.implemented_in
                  )
                end,
                accessibility: :public,
                annotations: [],
                alias_of: nil
              )
            end
          end
        end
      end
    end
  end
end

#build_singleton0(type_name) ⇒ Object

Builds a definition for singleton without .new method.



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# File 'lib/rbs/definition_builder.rb', line 266

def build_singleton0(type_name)
  try_cache type_name, cache: singleton0_cache do
    entry = env.class_decls[type_name] or raise "Unknown name for build_singleton0: #{type_name}"
    ensure_namespace!(type_name.namespace, location: entry.decls[0].decl.location)

    case entry
    when Environment::ClassEntry, Environment::ModuleEntry
      ancestors = ancestor_builder.singleton_ancestors(type_name)
      self_type = Types::ClassSingleton.new(name: type_name, location: nil)

      Definition.new(type_name: type_name, entry: entry, self_type: self_type, ancestors: ancestors).tap do |definition|
        one_ancestors = ancestor_builder.one_singleton_ancestors(type_name)

        if super_class = one_ancestors.super_class
          case super_class
          when Definition::Ancestor::Instance
            defn = build_instance(super_class.name)
            merge_definition(src: defn,
                             dest: definition,
                             subst: Substitution.build(defn.type_params, super_class.args),
                             keep_super: true)
          when Definition::Ancestor::Singleton
            defn = build_singleton0(super_class.name)
            merge_definition(src: defn, dest: definition, subst: Substitution.new, keep_super: true)
          end
        end

        one_ancestors.each_extended_module do |mod|
          mod_defn = build_instance(mod.name, no_self_types: true)
          merge_definition(src: mod_defn,
                           dest: definition,
                           subst: Substitution.build(mod_defn.type_params, mod.args))
        end

        interface_methods = {}
        one_ancestors.each_extended_interface do |mod|
          mod_defn = build_interface(mod.name)
          subst = Substitution.build(mod_defn.type_params, mod.args)

          mod_defn.methods.each do |name, method|
            if interface_methods.key?(name)
              src_member = mod.source

              raise unless src_member.is_a?(AST::Members::Extend)

              raise DuplicatedInterfaceMethodDefinitionError.new(
                type: self_type,
                method_name: name,
                member: src_member
              )
            end

            merge_method(type_name, interface_methods, name, method, subst, implemented_in: type_name)
          end
        end

        methods = method_builder.build_singleton(type_name)
        define_methods(definition, interface_methods: interface_methods, methods: methods, super_interface_method: false)

        entry.decls.each do |d|
          d.decl.members.each do |member|
            case member
            when AST::Members::AttrReader, AST::Members::AttrAccessor, AST::Members::AttrWriter
              if member.kind == :singleton
                ivar_name = case member.ivar_name
                            when false
                              nil
                            else
                              member.ivar_name || :"@#{member.name}"
                            end

                if ivar_name
                  insert_variable(type_name, definition.instance_variables, name: ivar_name, type: member.type)
                end
              end

            when AST::Members::ClassInstanceVariable
              insert_variable(type_name, definition.instance_variables, name: member.name, type: member.type)

            when AST::Members::ClassVariable
              insert_variable(type_name, definition.class_variables, name: member.name, type: member.type)
            end
          end
        end
      end
    end
  end
end

#define_methods(definition, interface_methods:, methods:, super_interface_method:) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 549

def define_methods(definition, interface_methods:, methods:, super_interface_method:)
  methods.each do |method_def|
    method_name = method_def.name
    original = method_def.original

    if original.is_a?(AST::Members::Alias)
      existing_method = interface_methods[method_name] || definition.methods[method_name]
      original_method = interface_methods[original.old_name] || definition.methods[original.old_name]

      unless original_method
        raise UnknownMethodAliasError.new(
          type_name: definition.type_name,
          original_name: original.old_name,
          aliased_name: original.new_name,
          location: original.location
        )
      end

      method = Definition::Method.new(
        super_method: existing_method,
        defs: original_method.defs.map do |defn|
          defn.update(defined_in: definition.type_name, implemented_in: definition.type_name)
        end,
        accessibility: method_def.accessibility,
        alias_of: original_method
      )
    else
      if interface_methods.key?(method_name)
        interface_method = interface_methods[method_name]

        if original = method_def.original
          raise DuplicatedMethodDefinitionError.new(
            type: definition.self_type,
            method_name: method_name,
            members: [original]
          )
        end

        definition.methods[method_name] = interface_method
      end

      existing_method = definition.methods[method_name]

      case original
      when AST::Members::MethodDefinition
        defs = original.types.map do |method_type|
          Definition::Method::TypeDef.new(
            type: method_type,
            member: original,
            defined_in: definition.type_name,
            implemented_in: definition.type_name
          )
        end

        # @type var accessibility: RBS::Definition::accessibility
        accessibility = if method_name == :initialize
                          :private
                        else
                          method_def.accessibility
                        end

        method = Definition::Method.new(
          super_method: existing_method,
          defs: defs,
          accessibility: accessibility,
          alias_of: nil
        )

      when AST::Members::AttrReader, AST::Members::AttrWriter, AST::Members::AttrAccessor
        method_type = if method_name.to_s.end_with?("=")
                        # setter
                        MethodType.new(
                          type_params: [],
                          type: Types::Function.empty(original.type).update(
                            required_positionals: [
                              Types::Function::Param.new(type: original.type, name: original.name)
                            ]
                          ),
                          block: nil,
                          location: nil
                        )
                      else
                        # getter
                        MethodType.new(
                          type_params: [],
                          type: Types::Function.empty(original.type),
                          block: nil,
                          location: nil
                        )
                      end
        defs = [
          Definition::Method::TypeDef.new(
            type: method_type,
            member: original,
            defined_in: definition.type_name,
            implemented_in: definition.type_name
          )
        ]

        method = Definition::Method.new(
          super_method: existing_method,
          defs: defs,
          accessibility: method_def.accessibility,
          alias_of: nil
        )

      when nil
        unless definition.methods.key?(method_name)
          raise InvalidOverloadMethodError.new(
            type_name: definition.type_name,
            method_name: method_name,
            kind: :instance,
            members: method_def.overloads
          )
        end

        if !super_interface_method && existing_method.defs.any? {|defn| defn.defined_in.interface? }
          super_method = existing_method.super_method
        else
          super_method = existing_method
        end

        method = Definition::Method.new(
          super_method: super_method,
          defs: existing_method.defs.map do |defn|
            defn.update(implemented_in: definition.type_name)
          end,
          accessibility: existing_method.accessibility,
          alias_of: existing_method.alias_of
        )
      end
    end

    method_def.overloads.each do |overload|
      type_defs = overload.types.map do |method_type|
        Definition::Method::TypeDef.new(
          type: method_type,
          member: overload,
          defined_in: definition.type_name,
          implemented_in: definition.type_name
        )
      end

      method.defs.unshift(*type_defs)
    end

    definition.methods[method_name] = method
  end

  interface_methods.each do |name, method|
    unless methods.methods.key?(name)
      merge_method(definition.type_name, definition.methods, name, method, Substitution.new)
    end
  end
end

#ensure_namespace!(namespace, location:) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 25

def ensure_namespace!(namespace, location:)
  namespace.ascend do |ns|
    unless ns.empty?
      NoTypeFoundError.check!(ns.to_type_name, env: env, location: location)
    end
  end
end

#expand_alias(type_name) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 783

def expand_alias(type_name)
  entry = env.alias_decls[type_name] or raise "Unknown name for expand_alias: #{type_name}"
  ensure_namespace!(type_name.namespace, location: entry.decl.location)
  entry.decl.type
end

#insert_variable(type_name, variables, name:, type:) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 541

def insert_variable(type_name, variables, name:, type:)
  variables[name] = Definition::Variable.new(
    parent_variable: variables[name],
    type: type,
    declared_in: type_name
  )
end

#merge_definition(src:, dest:, subst:, implemented_in: :keep, keep_super: false) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 705

def merge_definition(src:, dest:, subst:, implemented_in: :keep, keep_super: false)
  src.methods.each do |name, method|
    merge_method(dest.type_name, dest.methods, name, method, subst, implemented_in: implemented_in, keep_super: keep_super)
  end

  src.instance_variables.each do |name, variable|
    merge_variable(dest.instance_variables, name, variable, subst, keep_super: keep_super)
  end

  src.class_variables.each do |name, variable|
    merge_variable(dest.class_variables, name, variable, subst, keep_super: keep_super)
  end
end

#merge_method(type_name, methods, name, method, sub, implemented_in: :keep, keep_super: false) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 729

def merge_method(type_name, methods, name, method, sub, implemented_in: :keep, keep_super: false)
  if sub.empty? && implemented_in == :keep && keep_super
    methods[name] = method
  else
    if sub.empty? && implemented_in == :keep
      defs = method.defs
    else
      defs = method.defs.map do |defn|
        defn.update(
          type: sub.empty? ? defn.type : defn.type.sub(sub),
          implemented_in: case implemented_in
                          when :keep
                            defn.implemented_in
                          when nil
                            nil
                          else
                            implemented_in
                          end
        )
      end

      defs = method.defs.map do |defn|
        defn.update(
          type: sub.empty? ? defn.type : defn.type.sub(sub),
          implemented_in: case implemented_in
                          when :keep
                            defn.implemented_in
                          when nil
                            nil
                          else
                            implemented_in
                          end
        )
      end
    end

    super_method = methods[name]

    methods[name] = Definition::Method.new(
      super_method: keep_super ? method.super_method : super_method,
      accessibility: method.accessibility,
      defs: defs,
      alias_of: method.alias_of
    )
  end
end

#merge_variable(variables, name, variable, sub, keep_super: false) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 719

def merge_variable(variables, name, variable, sub, keep_super: false)
  super_variable = variables[name]

  variables[name] = Definition::Variable.new(
    parent_variable: keep_super ? variable.parent_variable : super_variable,
    type: sub.empty? ? variable.type : variable.type.sub(sub),
    declared_in: variable.declared_in
  )
end

#source_location(source, decl) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 449

def source_location(source, decl)
  case source
  when nil
    decl.location
  when :super
    case decl
    when AST::Declarations::Class
      decl.super_class&.location
    end
  else
    source.location
  end
end

#try_cache(type_name, cache:, key: type_name) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 776

def try_cache(type_name, cache:, key: type_name)
  # @type var cc: Hash[untyped, Definition | nil]
  cc = _ = cache

  cc[key] ||= yield
end

#update(env:, except:, ancestor_builder:) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 789

def update(env:, except:, ancestor_builder:)
  method_builder = self.method_builder.update(env: env, except: except)

  DefinitionBuilder.new(env: env, ancestor_builder: ancestor_builder, method_builder: method_builder).tap do |builder|
    builder.instance_cache.merge!(instance_cache)
    builder.singleton_cache.merge!(singleton_cache)
    builder.singleton0_cache.merge!(singleton0_cache)
    builder.interface_cache.merge!(interface_cache)

    except.each do |name|
      builder.instance_cache.delete([name, true])
      builder.instance_cache.delete([name, false])
      builder.singleton_cache.delete(name)
      builder.singleton0_cache.delete(name)
      builder.interface_cache.delete(name)
    end
  end
end

#validate_params_with(type_params, result:) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 439

def validate_params_with(type_params, result:)
  type_params.each do |param|
    unless param.skip_validation
      unless result.compatible?(param.name, with_annotation: param.variance)
        yield param
      end
    end
  end
end

#validate_type_params(definition, ancestors:, methods:) ⇒ Object 



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# File 'lib/rbs/definition_builder.rb', line 463

def validate_type_params(definition, ancestors:, methods:)
  type_params = definition.type_params_decl

  calculator = VarianceCalculator.new(builder: self)
  param_names = type_params.each.map(&:name)

  ancestors.each_ancestor do |ancestor|
    case ancestor
    when Definition::Ancestor::Instance
      result = calculator.in_inherit(name: ancestor.name, args: ancestor.args, variables: param_names)
      validate_params_with(type_params, result: result) do |param|
        decl = case entry = definition.entry
               when Environment::ModuleEntry, Environment::ClassEntry
                 entry.primary.decl
               when Environment::SingleEntry
                 entry.decl
               end

        raise InvalidVarianceAnnotationError.new(
          type_name: definition.type_name,
          param: param,
          location: source_location(ancestor.source, decl)
        )
      end
    end
  end

  methods.each do |defn|
    next if defn.name == :initialize

    method_types = case original = defn.original
                   when AST::Members::MethodDefinition
                     original.types
                   when AST::Members::AttrWriter, AST::Members::AttrReader, AST::Members::AttrAccessor
                     if defn.name.to_s.end_with?("=")
                       [
                         MethodType.new(
                           type_params: [],
                           type: Types::Function.empty(original.type).update(
                             required_positionals: [
                               Types::Function::Param.new(type: original.type, name: original.name)
                             ]
                           ),
                           block: nil,
                           location: original.location
                         )
                       ]
                     else
                       [
                         MethodType.new(
                           type_params: [],
                           type: Types::Function.empty(original.type),
                           block: nil,
                           location: original.location
                         )
                       ]
                     end
                   when AST::Members::Alias
                     nil
                   when nil
                     nil
                   end

    if method_types
      method_types.each do |method_type|
        result = calculator.in_method_type(method_type: method_type, variables: param_names)
        validate_params_with(type_params, result: result) do |param|
          raise InvalidVarianceAnnotationError.new(
            type_name: definition.type_name,
            param: param,
            location: method_type.location
          )
        end
      end
    end
  end
end