fixes #202, check IndexExpression

test/dart_codegen/expect/collection/splay_tree.dart

Index: test/dart_codegen/expect/collection/splay_tree.dart
diff --git a/test/dart_codegen/expect/collection/splay_tree.dart b/test/dart_codegen/expect/collection/splay_tree.dart
index 3a416b2c3d80f4a22cd9312cfebd090132aabb0a..9dd7394a8bad89e710585bd82fd021ebf89c08d3 100644
--- a/test/dart_codegen/expect/collection/splay_tree.dart
+++ b/test/dart_codegen/expect/collection/splay_tree.dart
@@ -151,7 +151,7 @@ _root = null;
  factory SplayTreeMap.from(Map other, [int compare(K key1, K key2), bool isValidKey(Object potentialKey)]) {
 SplayTreeMap<K, V> result = new SplayTreeMap<K, V>();
  other.forEach((k, v) {
-result[k] = DEVC$RT.cast(v, dynamic, V, "CompositeCast", """line 275, column 40 of dart:collection/splay_tree.dart: """, v is V, false);
+result[DEVC$RT.cast(k, dynamic, K, "CompositeCast", """line 275, column 35 of dart:collection/splay_tree.dart: """, k is K, false)] = DEVC$RT.cast(v, dynamic, V, "CompositeCast", """line 275, column 40 of dart:collection/splay_tree.dart: """, v is V, false);
 }
 );
  return result;