Support for-in in analyzer2dart.

pkg/analyzer2dart/test/end2end_data.dart

Index: pkg/analyzer2dart/test/end2end_data.dart
diff --git a/pkg/analyzer2dart/test/end2end_data.dart b/pkg/analyzer2dart/test/end2end_data.dart
index 572f294276fe27e0b952d23ac8ffb557050042ab..99fb7fff4f069f73d83bda08a6f2e45f2aeaf6b7 100644
--- a/pkg/analyzer2dart/test/end2end_data.dart
+++ b/pkg/analyzer2dart/test/end2end_data.dart
@@ -645,4 +645,59 @@ main() {
   }
 }'''),
   ]),
+
+  const Group('For in loop', const <TestSpec>[
+// TODO(johnniwinther): Add tests for `i` as top-level, static and instance
+// fields.
+    const TestSpec('''
+main(a) {
+  for (var i in a) {
+    print(i);
+  }
+}
+''', '''
+main(a) {
+  var v0 = a.iterator;
+  while (v0.moveNext()) {
+    print(v0.current);
+  }
+}'''),
+
+    const TestSpec('''
+main(a) {
+  for (var i in a) {
+    print(i);
+    i = 0;
+    print(i);
+  }
+}
+''', '''
+main(a) {
+  var v0 = a.iterator, i;
+  while (v0.moveNext()) {
+    i = v0.current;
+    print(i);
+    i = 0;
+    print(i);
+  }
+}
+'''),
+
+    const TestSpec('''
+main(a) {
+  var i;
+  for (i in a) {
+    print(i);
+  }
+}
+''', '''
+main(a) {
+  var i, v0 = a.iterator;
+  while (v0.moveNext()) {
+    i = v0.current;
+    print(i);
+  }
+}
+'''),
+  ]),
 ];