Robustify the treatement of DFunUnfolding

[ghc-hetmet.git] / compiler / coreSyn / CoreSubst.lhs

diff --git a/compiler/coreSyn/CoreSubst.lhs b/compiler/coreSyn/CoreSubst.lhs
index efd573d..3578037 100644 (file)
--- a/compiler/coreSyn/CoreSubst.lhs
+++ b/compiler/coreSyn/CoreSubst.lhs
@@ -442,7 +442,7 @@ It also unconditionally zaps the OccInfo.
 
 \begin{code}
 -- | Very similar to 'substBndr', but it always allocates a new 'Unique' for
--- each variable in its output and removes all 'IdInfo'
+-- each variable in its output.  It substitutes the IdInfo though.
 cloneIdBndr :: Subst -> UniqSupply -> Id -> (Subst, Id)
 cloneIdBndr subst us old_id
   = clone_id subst subst (old_id, uniqFromSupply us)
@@ -543,8 +543,8 @@ substUnfoldingSC subst unf   -- Short-cut version
   | isEmptySubst subst = unf
   | otherwise          = substUnfolding subst unf
 
-substUnfolding subst (DFunUnfolding con args)
-  = DFunUnfolding con (map (substExpr (text "dfun-unf") subst) args)
+substUnfolding subst (DFunUnfolding ar con args)
+  = DFunUnfolding ar con (map (substExpr (text "dfun-unf") subst) args)
 
 substUnfolding subst unf@(CoreUnfolding { uf_tmpl = tmpl, uf_src = src })
        -- Retain an InlineRule!