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-rw-r--r--compiler/vectorise/Vectorise/Monad/InstEnv.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/vectorise/Vectorise/Monad/InstEnv.hs b/compiler/vectorise/Vectorise/Monad/InstEnv.hs
index ceb62eef80..84b29ceb61 100644
--- a/compiler/vectorise/Vectorise/Monad/InstEnv.hs
+++ b/compiler/vectorise/Vectorise/Monad/InstEnv.hs
@@ -67,7 +67,7 @@ lookupInst cls tys
--
lookupFamInst :: TyCon -> [Type] -> VM FamInstMatch
lookupFamInst tycon tys
- = ASSERT( isFamilyTyCon tycon )
+ = ASSERT( isOpenFamilyTyCon tycon )
do { instEnv <- readGEnv global_fam_inst_env
; case lookupFamInstEnv instEnv tycon tys of
[match] -> return match