Johnni Winther
d0112f4431
Change-Id: I18b4b9979aea44b4dec64a5f1a32e67118b54a97 Reviewed-on: https://dart-review.googlesource.com/54222 Reviewed-by: Sigmund Cherem <sigmund@google.com>
35 lines
1.4 KiB
Dart
35 lines
1.4 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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import 'package:expect/expect.dart';
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/*element: main:[null]*/
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main() {
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dontTrustParameters();
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}
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////////////////////////////////////////////////////////////////////////////////
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// Test that we don't trust the explicit type of a parameter, but do trust
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// the local type of parameters in Dart 2.
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//
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// This means that in both Dart 1 and Dart 2 we infer the parameter type to be
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// either an int or a String. In Dart 1 we don't trust the static type of the
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// parameter within the method, so the return type is inferred to be either an
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// int or a String. In Dart 2 we _do_ trust the static type of the parameter
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// within the method and therefore infer the return type to be an int.
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////////////////////////////////////////////////////////////////////////////////
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/*kernel.element: _dontTrustParameters:Union([exact=JSString], [exact=JSUInt31])*/
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/*strong.element: _dontTrustParameters:[exact=JSUInt31]*/
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_dontTrustParameters(int /*Union([exact=JSString], [exact=JSUInt31])*/ i) {
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return i;
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}
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/*element: dontTrustParameters:[null]*/
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dontTrustParameters() {
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dynamic f = _dontTrustParameters;
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Expect.equals(0, f(0));
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Expect.throws(/*[null|subclass=Object]*/ () => f('foo'));
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}
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