Move toString() to collection classes.

tests/corelib/list_to_string2_test.dart

Index: tests/corelib/list_to_string2_test.dart
diff --git a/tests/compiler/dart2js_extra/regress/4515_3_test.dart b/tests/corelib/list_to_string2_test.dart
similarity index 50%
copy from tests/compiler/dart2js_extra/regress/4515_3_test.dart
copy to tests/corelib/list_to_string2_test.dart
index f224d709ae8c32c5a3a8d497c3bc0147f1fdb86a..9fcf0fac7ac0544fac6f958bb3475c4b385a47bc 100644
--- a/tests/compiler/dart2js_extra/regress/4515_3_test.dart
+++ b/tests/corelib/list_to_string2_test.dart
@@ -4,19 +4,17 @@
 
 import "package:expect/expect.dart";
 
-class A {
-  a(x) => x + 1;
-}
-
-f(p) => p("A");
-
 main() {
-  A a = new A();
-  a.a(1);
-  var v = null;
-  try {
-    v = f(a.a);
-  } catch (e) { }
+  List list = [1, 2];
+  list.add(list);
+  
+  List list2 = new List(4);
+  list2[0] = 1;
+  list2[1] = 2;
+  list2[2] =list2;
+  list2[3] = list;
+  
+  Expect.equals("[1, 2, [...]]", list.toString());
+  Expect.equals("[1, 2, [...], [1, 2, [...]]]", list2.toString());
 
-  Expect.equals(null, v);
-}
+}