Hide MirroredCompilationErrror behind a flag until post-1.0.

runtime/vm/exceptions.cc

Index: runtime/vm/exceptions.cc
diff --git a/runtime/vm/exceptions.cc b/runtime/vm/exceptions.cc
index 53654199730d1a0d4a856a512dc2797a6807ab3e..19556b190e6fbcbb8ceba21903cbbe9ec0857a82 100644
--- a/runtime/vm/exceptions.cc
+++ b/runtime/vm/exceptions.cc
@@ -692,10 +692,6 @@ RawObject* Exceptions::Create(ExceptionType type, const Array& arguments) {
       class_name = &Symbols::AbstractClassInstantiationError();
       constructor_name = &Symbols::DotCreate();
       break;
-    case kMirroredUncaughtExceptionError:
-      library = Library::MirrorsLibrary();
-      class_name = &Symbols::MirroredUncaughtExceptionError();

[siva, 2013/10/19 00:25:14]

Need to also remove it from Symbols.h

[rmacnak, 2013/10/21 18:26:09]

Done.

-      break;
     case kMirroredCompilationError:
       library = Library::MirrorsLibrary();
       class_name = &Symbols::MirroredCompilationError();