diff options
Diffstat (limited to 'compiler/GHC/Core/TyCo/Subst.hs')
| -rw-r--r-- | compiler/GHC/Core/TyCo/Subst.hs | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/compiler/GHC/Core/TyCo/Subst.hs b/compiler/GHC/Core/TyCo/Subst.hs index d85052700c..64e0c9ccbb 100644 --- a/compiler/GHC/Core/TyCo/Subst.hs +++ b/compiler/GHC/Core/TyCo/Subst.hs @@ -436,8 +436,8 @@ mkTvSubstPrs prs = zipTyEnv :: HasDebugCallStack => [TyVar] -> [Type] -> TvSubstEnv zipTyEnv tyvars tys | debugIsOn - , not (all isTyVar tyvars) - = pprPanic "zipTyEnv" (ppr tyvars <+> ppr tys) + , not (all isTyVar tyvars && (tyvars `equalLength` tys)) + = pprPanic "zipTyEnv" (ppr tyvars $$ ppr tys) | otherwise = ASSERT( all (not . isCoercionTy) tys ) zipToUFM tyvars tys |