Index: pkg/compiler/lib/src/types/type_mask.dart |
diff --git a/pkg/compiler/lib/src/types/type_mask.dart b/pkg/compiler/lib/src/types/type_mask.dart |
index a6ac4025b3474139e42e5dc101d80f3f0b3fbe04..8b20d127545ec897fe061d01ee403f46463c72db 100644 |
--- a/pkg/compiler/lib/src/types/type_mask.dart |
+++ b/pkg/compiler/lib/src/types/type_mask.dart |
@@ -54,7 +54,8 @@ abstract class TypeMask { |
factory TypeMask.nonNullExact(ClassElement base, ClassWorld classWorld) { |
assert(invariant(base, classWorld.isInstantiated(base), |
- message: "Cannot create extact type mask for uninstantiated class")); |
+ message: "Cannot create extact type mask for " |
+ "uninstantiated class $base")); |
return new FlatTypeMask.nonNullExact(base); |
} |