- filed bug: label identifiers should not be allowed to match other identifiers in the same scope.
- filed bug: label identifiers should not be allowed to match
other identifiers in the same scope.

R=r
OCL=13431
CL=13431
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go