TypeSystem/inference/getter_setter_override_inference_A06_t07.dart

// Copyright (c) 2026, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

/// @assertion The type of a non-final field which overrides both a setter and a
/// getter is inferred to be the parameter type of the combined member signature
/// of said setter in the direct superinterfaces, if this type is the same as
/// the return type of the combined member signature of said getter in the
/// direct superinterfaces. If the types are not the same then inference fails
/// with an error.
///
/// @description Check that the type of a non-final field which overrides both a
/// setter and a getter is inferred to be the parameter type of the combined
/// member signature of said setter in the direct superinterfaces. Test the case
/// where the combined member signature computation is non-trivial.
/// @author sgrekhov22@gmail.com

import '../../Utils/static_type_helper.dart';

mixin class A {
  void set m1(num _) {}
  num get m1 => 0;
  void set m2(int _) {}
  num get m2 => 42;
}

mixin class B {
  void set m1(int _) {}
  num get m1 => 0;
  void set m2(num _) {}
  num get m2 => 42;
}

class C implements A, B {
  var m1 = 0;
  var m2 = 0;
}

mixin class MC implements A, B {
  var m1 = 0;
  var m2 = 0;
}

mixin M on A, B {
  var m1 = 0;
  var m2 = 0;
}

main() {
  C().m1.expectStaticType<Exactly<num>>();
  C().m2.expectStaticType<Exactly<num>>();
  MC().m1.expectStaticType<Exactly<num>>();
  MC().m2.expectStaticType<Exactly<num>>();
  print(M);
}