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// Copyright (c) 2011, 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.
// Dart test program for testing for statement which captures loop variable.
import "package:expect/expect.dart";
var f;
main() {
// Capture the loop variable, ensure we capture the right value.
for (int i = 0; i < 10; i++) {
if (i == 7) {
f = () => "i = $i";
}
}
Expect.equals("i = 7", f());
// There is only one instance of k. The captured variable continues
// to change.
int k;
for (k = 0; k < 10; k++) {
if (k == 7) {
f = () => "k = $k";
}
}
Expect.equals("k = 10", f());
// l gets modified after it's captured. n++ is executed on the
// newly introduced instance of n (i.e. the instance of the loop
// iteration after the value is captured).
for (int n = 0; n < 10; n++) {
var l = n;
if (l == 7) {
f = () => "l = $l, n = $n";
}
l++;
}
Expect.equals("l = 8, n = 7", f());
// Loop variable is incremented in loop body instead of the increment.
// expression. Thus, the captured value is incremented by one before
// a new loop variable instance is created.
for (int i = 0; i < 10; /*nothing*/) {
if (i == 7) {
f = () => "i = $i";
}
i++;
}
Expect.equals("i = 8", f());
// Make sure continue still ensures the loop variable is captured correctly.
for (int i = 0; i < 10; i++) {
if (i == 7) {
f = () => "i = $i";
}
continue;
i++;
}
Expect.equals("i = 7", f());
// Nested loops with captured variables.
for (int k = 0; k < 5; k++) {
for (int i = 0; i < 10; i++) {
if (k == 3 && i == 7) {
f = () => "k = $k, i = $i";
}
}
}
Expect.equals("k = 3, i = 7", f());
}