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module FFI
  class AutoPointer < Pointer
    class Releaser
      attr_accessor autorelease: boolish
      interface _Proc[P < Pointer]
        def call: (P) -> void
      end
      def initialize: [P < Pointer] (P ptr, _Proc[P] proc) -> void

      def call: (*untyped) -> void
      def free: () -> nil
      def release: (Pointer ptr) -> void
    end

    def initialize: (Pointer pointer, Method | ^(instance) -> void | Releaser::_Proc[instance] callable) -> self
                  | (Pointer pointer) -> self # where class < `def self.release: (instance pointer) -> void`

    extend DataConverter[Pointer, instance, nil]
    def self.from_native: ...
    def self.native_type: () -> Type::Builtin

    def autorelease?: ...
    def autorelease=: ...
    def free: () -> nil
  end
end