Allow cascades in initializer lists.

tests/language/cascade_in_initializer_list_test.dart

Index: tests/language/cascade_in_initializer_list_test.dart
diff --git a/tests/compiler/dart2js_extra/regress/4515_3_test.dart b/tests/language/cascade_in_initializer_list_test.dart
similarity index 62%
copy from tests/compiler/dart2js_extra/regress/4515_3_test.dart
copy to tests/language/cascade_in_initializer_list_test.dart
index 319eb0cac719a777093aa372c3e2f0e27b396612..c1e592e2f255c6dbc96bd65d42d69530b630b8ca 100644
--- a/tests/compiler/dart2js_extra/regress/4515_3_test.dart
+++ b/tests/language/cascade_in_initializer_list_test.dart
@@ -3,18 +3,17 @@
 // BSD-style license that can be found in the LICENSE file.
 
 class A {
-  a(x) => x + 1;
+  foo() {}
+  bar() {}
 }
 
-f(p) => p("A");
+class B {
+  var x;
 
-main() {
-  A a = new A();
-  a.a(1);
-  var v = null;
-  try {
-    v = f(a.a);
-  } catch (e) { }
-
-  Expect.equals(null, v);
+  B(a) : x = a..foo()..bar() {}
 }
+
+main() {
+  var a = new A(), b = new B(a);
+  Expect.equals(a, b.x);
+}