Robert Nystrom
fc1b1ecc71
Change-Id: Idbcc965a27e9ffeedf5e0a1068b019de4193070f Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/127745 Commit-Queue: Bob Nystrom <rnystrom@google.com> Reviewed-by: Alexander Thomas <athom@google.com>
37 lines
1.0 KiB
Dart
37 lines
1.0 KiB
Dart
// Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// Dart test program to test arithmetic operations.
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class B {}
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class C {
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B call(B b) => b;
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}
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typedef B BToB(B x);
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class D {
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BToB f() => null;
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void g(C x) {}
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}
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class E extends D {
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// This override is illegal because C is not a subtype of BToB.
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C f() => null;
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//^
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// [analyzer] COMPILE_TIME_ERROR.INVALID_OVERRIDE
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// [cfe] The return type of the method 'E.f' is 'C', which does not match the return type, 'B Function(B)', of the overridden method, 'D.f'.
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// This override is illegal because BToB is not a supertype of C.
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void g(BToB x) {}
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// ^
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// [analyzer] COMPILE_TIME_ERROR.INVALID_OVERRIDE
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// ^
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// [cfe] The parameter 'x' of the method 'E.g' has type 'B Function(B)', which does not match the corresponding type, 'C', in the overridden method, 'D.g'.
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}
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main() {
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new E();
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}
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