Fix dangling else.

tests/language/dangling_else_test.dart

+// 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.
+// Tests dangling else. The VM should not have any problems, but dart2js or
+// dart2dart could get this wrong.
+
+nestedIf1(notTrue) {
+  if (notTrue) return 'bad input';
+  if (notTrue) {
+    if (notTrue) {
+      return 'bad';
+    }
+  } else {
+    return 'good';
+  }
+  return 'bug';
+}
+
+nestedIf2(notTrue) {
+  if (notTrue) return 'bad input';
+  if (notTrue) {
+    if (notTrue) {
+      return 'bad';
+    } else {
+      if (notTrue) {
+        return 'bad';
+      }
+    }
+  } else {
+    return 'good';
+  }
+  return 'bug';
+}
+
+nestedWhile(notTrue) {
+  if (notTrue) return 'bad input';
+  if (notTrue) {
+    while(notTrue) {
+      if (notTrue) {
+        return 'bad';
+      }
+    }
+  } else {
+    return 'good';
+  }
+  return 'bug';
+}
+
+nestedFor(notTrue) {
+  if (notTrue) return 'bad input';
+  if (notTrue) {
+    for (int i = 0; i < 3; i++) {
+      if (i == 0) {
+        return 'bad';
+      }
+    }
+  } else {
+    return 'good';
+  }
+  return 'bug';
+}
+
+nestedLabeledStatement(notTrue) {
+  if (notTrue) return 'bad input';
+  if (notTrue) {
+    label:
+    if (notTrue) {
+      break label;
+    }
+  } else {
+    return 'good';
+  }
+  return 'bug';
+}
+
+main() {
+  Expect.equals('good', nestedIf1(false));
+  Expect.equals('good', nestedIf2(false));
+  Expect.equals('good', nestedWhile(false));
+  Expect.equals('good', nestedFor(false));
+  Expect.equals('good', nestedLabeledStatement(false));
+}