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-rw-r--r--compiler/vectorise/Vectorise/Type/Env.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/vectorise/Vectorise/Type/Env.hs b/compiler/vectorise/Vectorise/Type/Env.hs
index 612c051a2c..9526feddaf 100644
--- a/compiler/vectorise/Vectorise/Type/Env.hs
+++ b/compiler/vectorise/Vectorise/Type/Env.hs
@@ -365,7 +365,7 @@ vectTypeEnv tycons vectTypeDecls vectClassDecls
defDataCons
| isAbstract = return ()
| otherwise
- = do { MASSERT(length (tyConDataCons origTyCon) == length (tyConDataCons vectTyCon))
+ = do { MASSERT(tyConDataCons origTyCon `equalLength` tyConDataCons vectTyCon)
; zipWithM_ defDataCon (tyConDataCons origTyCon) (tyConDataCons vectTyCon)
}