Robert Nystrom
b4d17e9c07
Change-Id: I3ec18bb7e7cfb087a58d744d357bf004c0438ba9 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/147813 Commit-Queue: Bob Nystrom <rnystrom@google.com> Auto-Submit: Bob Nystrom <rnystrom@google.com> Reviewed-by: Erik Ernst <eernst@google.com>
45 lines
1.3 KiB
Dart
45 lines
1.3 KiB
Dart
// Copyright (c) 2017, 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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// Test that if the type of a parameter of a generic method is a type parameter,
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// the type of the passed argument is checked (01) at compile time
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// if the receiver is given via an interface-type variable, and (02) at runtime
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// if the receiver is dynamic.
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library generic_methods_dynamic_test;
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import "package:expect/expect.dart";
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class A {}
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class B {}
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class C {
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T foo<T>(T t) => t;
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List<T> bar<T>(Iterable<T> t) => <T>[t.first];
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}
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main() {
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B b = new B();
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C c = new C();
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dynamic obj = c;
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c.foo<A>(b); //# 01: compile-time error
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obj.foo<A>(b); //# 02: runtime error
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c.bar<A>(<B>[new B()]); //# 03: compile-time error
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obj.bar<A>(<B>[new B()]); //# 04: runtime error
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Expect.equals(c.foo<B>(b), b); //# 05: ok
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Expect.equals(obj.foo<B>(b), b); //# 05: continued
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dynamic x = c.bar<B>(<B>[new B()]); //# 05: continued
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Expect.isTrue(x is List<B>); //# 05: continued
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Expect.equals(x.length, 1); //# 05: continued
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dynamic y = obj.bar<B>(<B>[new B()]); //# 05: continued
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Expect.isTrue(y is List<B>); //# 05: continued
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Expect.equals(y.length, 1); //# 05: continued
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}
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