Handling warings if compiltation succeeds; +1 supported regex pattern for error header; minor improvements.
Handling warings if compiltation succeeds; +1 supported regex pattern for error header; minor improvements.

google/codeworld,alphalambda/codeworld,alphalambda/codeworld,pranjaltale16/codeworld,pranjaltale16/codeworld,google/codeworld,pranjaltale16/codeworld,alphalambda/codeworld,google/codeworld