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d14ab0779a
Change-Id: I9c486f29f3bcf8a6ecf481eb25ea61d0468049b2 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/150667 Commit-Queue: Joshua Litt <joshualitt@google.com> Reviewed-by: Nicholas Shahan <nshahan@google.com>
52 lines
1.8 KiB
Dart
52 lines
1.8 KiB
Dart
// Copyright (c) 2019, 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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import 'dart:_runtime' show gFnType, typeRep, isSubtypeOf;
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import 'package:expect/expect.dart';
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/// Returns an unwrapped generic function type with a bounded type argument in
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/// the form: <T extends [bound]> void -> void.
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///
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// TODO(nshahan): The generic function type is created as a legacy type.
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genericFunction(bound) => gFnType((T) => [typeRep<void>(), []], (T) => [bound]);
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/// Returns an unwrapped generic function type with a bounded type argument in
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/// the form: <T extends [bound]> [argumentType] -> T.
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///
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// TODO(nshahan): The generic function type is created as a legacy type.
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functionGenericReturn(bound, argumentType) => gFnType(
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(T) => [
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T,
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[argumentType]
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],
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(T) => [bound]);
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/// Returns an unwrapped generic function type with a bounded type argument in
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/// the form: <T extends [bound]> T -> [returnType].
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///
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// TODO(nshahan): The generic function type is created as a legacy type.
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functionGenericArg(bound, returnType) => gFnType(
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(T) => [
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returnType,
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[T]
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],
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(T) => [bound]);
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void checkSubtype(s, t) =>
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Expect.isTrue(isSubtypeOf(s, t), '$s should be subtype of $t.');
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void checkProperSubtype(s, t) {
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Expect.isTrue(isSubtypeOf(s, t), '$s should be subtype of $t.');
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checkSubtypeFailure(t, s);
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}
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void checkMutualSubtype(Object s, Object t) {
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Expect.isTrue(isSubtypeOf(s, t), '$s should be subtype of $t.');
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Expect.isTrue(isSubtypeOf(t, s), '$t should be subtype of $s.');
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}
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void checkSubtypeFailure(s, t) =>
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Expect.isFalse(isSubtypeOf(s, t), '$s should not be subtype of $t.');
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