Sigmund Cherem
912005267d
Change-Id: I46be49b2effec3e38a3dc44cd45cfe736f77fa78 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/182680 Commit-Queue: Sigmund Cherem <sigmund@google.com> Reviewed-by: Joshua Litt <joshualitt@google.com> Reviewed-by: Nicholas Shahan <nshahan@google.com> Reviewed-by: Stephen Adams <sra@google.com>
70 lines
2.5 KiB
Dart
70 lines
2.5 KiB
Dart
// Copyright (c) 2020, 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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// Requirements=nnbd-strong
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import 'package:expect/expect.dart';
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import 'deferred_apply_lib.dart' deferred as lib;
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// Test that the `_Required` sentinel in apply-metadata is initialized.
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//
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// This test is structured so that `Function.apply` is partioned out of the main
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// unit into a 'part' file. `Function.apply` contains a reference to the
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// `_Required` sentinel marker, which causes the marker to also be in that part.
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// The apply-metadata for the functions [foo1] and [foo2] contains references to
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// the sentinel that are in the main unit.
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//
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// This apparent reference to the deferred-loaded constant is not a problem
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// because the apply-metadata is contained in a JavaScript function which is not
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// called until the function is passed to `Function.apply`. The loading of the
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// part containing `Function.apply` also loads the sentinel in advance of it
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// being referenced.
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//
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// An implicit constraint here is that the apply-metadata must not be used
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// outside of code that also references the sentinel.
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//
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// If the apply-metadata is created eagerly, or we add other uses of the
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// apply-metadata, then we would need to ensure the constant is located to be
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// available at that time.
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main() {
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lib.loadLibrary().then((_) {
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Expect.equals('10', lib.apply1(foo1));
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Expect.equals('10,$text1', lib.apply1(foo2));
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Expect.throws(() => lib.apply2(foo2));
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});
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}
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class Text {
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final String string;
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final String source;
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const Text(this.string, [this.source = '']);
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String toString() => string;
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}
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String foo1({required int req1}) {
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return '$req1';
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}
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String foo2({required int req1, Text? text = text1}) {
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return '$req1,$text';
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}
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const text1 = Text(r"""
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Those lines that I before have writ do lie,
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Even those that said I could not love you dearer:
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Yet then my judgment knew no reason why
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My most full flame should afterwards burn clearer.
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But reckoning Time, whose million'd accidents
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Creep in 'twixt vows, and change decrees of kings,
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Tan sacred beauty, blunt the sharp'st intents,
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Divert strong minds to the course of altering things;
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Alas! why, fearing of Time's tyranny,
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Might I not then say, 'Now I love you best,'
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When I was certain o'er incertainty,
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Crowning the present, doubting of the rest?
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Love is a babe, then might I not say so,
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To give full growth to that which still doth grow?
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""");
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