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-rw-r--r--compiler/simplCore/Simplify.lhs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/simplCore/Simplify.lhs b/compiler/simplCore/Simplify.lhs
index 56e0bededd..cf917a27a5 100644
--- a/compiler/simplCore/Simplify.lhs
+++ b/compiler/simplCore/Simplify.lhs
@@ -730,7 +730,7 @@ simplUnfolding :: SimplEnv-> TopLevelFlag
simplUnfolding env _ _ _ (DFunUnfolding ar con ops)
= return (DFunUnfolding ar con ops')
where
- ops' = map (substExpr (text "simplUnfolding") env) ops
+ ops' = map (fmap (substExpr (text "simplUnfolding") env)) ops
simplUnfolding env top_lvl id _
(CoreUnfolding { uf_tmpl = expr, uf_arity = arity