zipTopTvSubst tyvars tys
#ifdef DEBUG
| length tyvars /= length tys
- = pprTrace "zipOpenTvSubst" (ppr tyvars $$ ppr tys) emptyTvSubst
+ = pprTrace "zipTopTvSubst" (ppr tyvars $$ ppr tys) emptyTvSubst
| otherwise
#endif
= TvSubst emptyInScopeSet (zipTyEnv tyvars tys)