Stop mapping indexOf/lastIndexOf directly to the JavaScript native on indexable primitives.

tests/corelib/list_test.dart

Index: tests/corelib/list_test.dart
diff --git a/tests/corelib/list_test.dart b/tests/corelib/list_test.dart
index 795b94cd22bdb4a858aaca288ed39fbce49931da..a98f4a8eaf4f17a0c6d6f4056b2afa5be3215289 100644
--- a/tests/corelib/list_test.dart
+++ b/tests/corelib/list_test.dart
@@ -65,9 +65,26 @@ class ListTest {
     }
 
     for (int i = 0; i < 4; i++) {
-      Expect.equals(list[i], i);
+      Expect.equals(i, list[i]);
+      Expect.equals(i, list.indexOf(i));
+      Expect.equals(i, list.lastIndexOf(i));
     }
 
+    Expect.equals(-1, list.indexOf(100));
+    Expect.equals(-1, list.lastIndexOf(100));
+    list[2] = new Yes();
+    Expect.equals(2, list.indexOf(100));
+    Expect.equals(2, list.lastIndexOf(100));
+    list[3] = new Yes();
+    Expect.equals(2, list.indexOf(100));
+    Expect.equals(3, list.lastIndexOf(100));
+    list[2] = 2;
+    Expect.equals(3, list.indexOf(100));
+    Expect.equals(3, list.lastIndexOf(100));
+    list[3] = 3;
+    Expect.equals(-1, list.indexOf(100));
+    Expect.equals(-1, list.lastIndexOf(100));
+
     testClosures(list);
 
     var exception = null;
@@ -96,9 +113,26 @@ class ListTest {
 
     Expect.equals(list.length, 10);
     for (int i = 0; i < 10; i++) {
-      Expect.equals(list[i], i);
+      Expect.equals(i, list[i]);
+      Expect.equals(i, list.indexOf(i));
+      Expect.equals(i, list.lastIndexOf(i));
     }
 
+    Expect.equals(-1, list.indexOf(100));
+    Expect.equals(-1, list.lastIndexOf(100));
+    list[2] = new Yes();
+    Expect.equals(2, list.indexOf(100));
+    Expect.equals(2, list.lastIndexOf(100));
+    list[3] = new Yes();
+    Expect.equals(2, list.indexOf(100));
+    Expect.equals(3, list.lastIndexOf(100));
+    list[2] = 2;
+    Expect.equals(3, list.indexOf(100));
+    Expect.equals(3, list.lastIndexOf(100));
+    list[3] = 3;
+    Expect.equals(-1, list.indexOf(100));
+    Expect.equals(-1, list.lastIndexOf(100));
+
     testClosures(list);
 
     Expect.equals(list.removeLast(), 9);
@@ -109,6 +143,10 @@ class ListTest {
   }
 }
 
+class Yes {
+  operator ==(var other) => true;
+}
+
 main() {
   ListTest.testMain();
 }