LanguageFeatures/Records/primitive_equality_A01_t01.dart

// Copyright (c) 2022, 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 A record object has a primitive == operator if all of its field
/// have primitive == operators.
///
/// Note that this is a dynamic property of a record object, not a property of
/// its static type. Since primitive equality only comes into play in constants,
/// the compiler can see the actual field values for a relevant record at
/// compile time because it has the actual constant record value with all of its
/// constant fields. This means a record can be used in a constant set or as a
/// constant map key, but only when its field values could be as well.
///
/// @description Checks that if all of the record fields have a primitive ==
/// operator then this record can be used in a constant set
/// @author sgrekhov22@gmail.com

import "../../Utils/expect.dart";

class C {
  const C();
}

main() {
  const s1 = {const (1, "2", String, C(), Object(), Symbol('foo'))};
  const s2 = {(1, "2", String, const C(), const Object(), const Symbol('foo'))};
  const s3 = {
    const (one: 1, two: "2", three: String, four: C(), five: Object(),
      six: Symbol('foo'))
  };
  const s4 = {
    (one: 1, two: "2", three: String, four: const C(), five: const Object(),
      six: const Symbol('foo'))
  };
  const s5 = {
    const (1, two: "2", String, four: C(), five: Object(), Symbol('foo'))
  };
  const s6 = {
    (1, two: "2", String, four: const C(), five: const Object(),
      const Symbol('foo'))
  };

  Expect.equals(s1, s2);
  Expect.equals(s3, s4);
  Expect.equals(s5, s6);
}