Test for immutable Lists in ListSet API methods.

runtime/bin/socket_impl.dart

Index: runtime/bin/socket_impl.dart
diff --git a/runtime/bin/socket_impl.dart b/runtime/bin/socket_impl.dart
index ef909cac57cbe264b790a355c29c267da0d13352..9cc1a1a5bbfadccc209624b4fa2452693f1beffd 100644
--- a/runtime/bin/socket_impl.dart
+++ b/runtime/bin/socket_impl.dart
@@ -296,7 +296,11 @@ class _Socket extends _SocketBase implements Socket {
       if ((offset + bytes) > buffer.length) {
         throw new IndexOutOfRangeException(offset + bytes);
       }
-      return _readList(buffer, offset, bytes);
+      int result = _readList(buffer, offset, bytes);
+      if (result < 0) {
+        throw new SocketIOException("Error: readList failed");

[turnidge, 2011/11/16 18:50:18]

Yeah, here would be a good place to have that error information, perhaps.

+      }
+      return result;
     }
     throw new
         SocketIOException("Error: readList failed - invalid socket handle");