Make RuntimeError an Error

sdk/lib/core/errors.dart

Index: sdk/lib/core/errors.dart
diff --git a/sdk/lib/core/errors.dart b/sdk/lib/core/errors.dart
index eeb0c04fdef2e4f25040354dc318709b320b4728..ab087ee85b4928fc3261653fb3afb4ae227ce809 100644
--- a/sdk/lib/core/errors.dart
+++ b/sdk/lib/core/errors.dart
@@ -245,3 +245,12 @@ class StackOverflowError implements Error {
   const StackOverflowError();
   String toString() => "Stack Overflow";
 }
+
+/**
+ * Exception thrown when a runtime error occurs.

[karlklose, 2012/12/07 09:27:38]

Exception -> Error.

[Johnni Winther, 2012/12/11 15:30:24]

Done.

+ */
+class RuntimeError implements Error {

[Lasse Reichstein Nielsen, 2012/12/06 19:40:54]

If the VM doesn't use this class, and I don't think it does since it's not
mentioned in exceptions.h, this could just as well be in js_helper.dart.
(Alternatively coordinate with the VM about how to handle runtime errors).

[Johnni Winther, 2012/12/11 15:30:24]

Some language tests rely on it so it cannot be moved to js_helper immediately.

+  final message;
+  RuntimeError(this.message);
+  String toString() => "RuntimeError: $message";
+}