Alexander Markov
0ea5612753
This test exercises recursive static field initialization. Under the new language semantics all static fields are implicitly late, The test was using 'final' fields, which can be initialized only once, but the test attempted to initialize those fields multiple times during recursive invocation. This results in LateInitializationError. So the test is updated to use non-final fields which allow multiple writes. Relevant paragraph from the spec: Let D be a late and final local variable declaration named v. It is a run-time error, throwing an instance of LateInitializationError, to assign a value to v if a value has previously been assigned to v. Note that this includes the implicit initializing writes induced by evaluating the initializer during a read. Change-Id: I577cb9d189c1e6975ea5f21fab64d5b1204315d8 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/154823 Reviewed-by: Bob Nystrom <rnystrom@google.com> Commit-Queue: Alexander Markov <alexmarkov@google.com>
77 lines
1.4 KiB
Dart
77 lines
1.4 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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import "package:expect/expect.dart";
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// Test re-entrant initializer - calls throw StackOverflowError.
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var trace;
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var foo = bar;
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var recursionDepth = 0;
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get bar {
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if (recursionDepth > 3) throw "recursed";
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recursionDepth++;
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trace.add(recursionDepth);
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try {
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return foo ?? 1;
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} catch (e) {
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trace.add(e);
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}
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return 42;
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}
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void testTopLevel() {
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trace = [];
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recursionDepth = 0;
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var result = foo;
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Expect.equals(42, result);
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Expect.equals('1,2,3,4,recursed', trace.join(','));
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trace = [];
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recursionDepth = 0;
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result = foo;
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Expect.equals(42, result);
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Expect.equals('', trace.join(','));
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}
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class X {
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static var foo = X.bar;
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static get bar {
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if (recursionDepth > 3) throw "recursed";
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recursionDepth++;
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trace.add(recursionDepth);
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try {
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return foo ?? 1;
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} catch (e) {
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trace.add(e);
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}
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return 49;
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}
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}
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void testClassStatic() {
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trace = [];
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recursionDepth = 0;
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var result = X.foo;
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Expect.equals(49, result);
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Expect.equals('1,2,3,4,recursed', trace.join(','));
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trace = [];
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recursionDepth = 0;
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result = X.foo;
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Expect.equals(49, result);
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Expect.equals('', trace.join(','));
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}
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main() {
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testTopLevel();
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testClassStatic();
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}
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