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 // Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file // for details. All rights reserved. Use of this source code is governed by a // BSD-style license that can be found in the LICENSE file. import "package:expect/expect.dart"; class A { List list; A(int a, int b) : list = [a, b]; operator [](index) => list[index]; operator []=(index, value) => list[index] = value; } class B { int value; List trace; B(this.trace) : value = 100; operator [](index) { trace.add(-3); trace.add(index); trace.add(this.value); this.value = this.value + 1; return this; } operator []=(index, value) { trace.add(-5); trace.add(index); trace.add(value.value); this.value = this.value + 1; } operator +(int value) { trace.add(-4); trace.add(this.value); trace.add(value); this.value = this.value + 1; return this; } } B getB(trace) { trace.add(-1); return new B(trace); } int getIndex(trace) { trace.add(-2); return 42; } main() { A a = new A(1, 2); Expect.equals(1, a[0]); Expect.equals(2, a[1]); Expect.equals(1, a[0]++); Expect.equals(2, a[0]); Expect.equals(2, a[0]--); Expect.equals(1, a[0]); Expect.equals(0, --a[0]); Expect.equals(0, a[0]); Expect.equals(1, ++a[0]); Expect.equals(1, a[0]); a[0] += 2; Expect.equals(3, a[0]); List trace = []; getB(trace)[getIndex(trace)] += 37; Expect.listEquals([-1, -2, -3, 42, 100, -4, 101, 37, -5, 42, 102], trace); }