Robert Nystrom
3166d7188f
Since I regenerated the test expectations, this also fills in a few unspecified errors with more precise information. Change-Id: I4a2450de030a7d38b08f30f46d9d9feca99404f5 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/407082 Reviewed-by: Lasse Nielsen <lrn@google.com> Commit-Queue: Lasse Nielsen <lrn@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com>
48 lines
1.3 KiB
Dart
48 lines
1.3 KiB
Dart
// Copyright (c) 2024, 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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/// Tests that the type inference for generic extension method invocations
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/// properly accounts for the downward inference context.
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import 'package:expect/static_type_helper.dart';
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extension E on Object? {
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T f<T>(List<T> t) => t.first;
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}
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class C {
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T g<T>(List<T> t) => t.first;
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}
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main() {
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var string = '';
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context<int>(
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string.f(contextType([1])..expectStaticType<Exactly<List<int>>>()),
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);
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context<int>(
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E(string).f(contextType([1])..expectStaticType<Exactly<List<int>>>()),
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);
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var nullableString = '' as String?;
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context<int?>(
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nullableString?.f(
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contextType([1])..expectStaticType<Exactly<List<int?>>>(),
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),
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);
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context<int?>(
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E(
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nullableString,
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)?.f(contextType([1])..expectStaticType<Exactly<List<int?>>>()),
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);
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// And just to verify that the expectations above are reasonable, repeat the
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// same thing with an ordinary class:
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var c = C();
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context<int>(c.g(contextType([1])..expectStaticType<Exactly<List<int>>>()));
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var nullableC = C() as C?;
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context<int?>(
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nullableC?.g(contextType([1])..expectStaticType<Exactly<List<int?>>>()),
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);
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}
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