Comments only

diff --git a/compiler/coreSyn/CoreSubst.lhs b/compiler/coreSyn/CoreSubst.lhs
index 6a2255c..8306c04 100644 (file)
--- a/compiler/coreSyn/CoreSubst.lhs
+++ b/compiler/coreSyn/CoreSubst.lhs
@@ -307,6 +307,7 @@ substRecBndrs subst bndrs
 substIdBndr :: Subst           -- Substitution to use for the IdInfo
            -> Subst -> Id      -- Substitition and Id to transform
            -> (Subst, Id)      -- Transformed pair
+                               -- NB: unfolding may be zapped
 
 substIdBndr rec_subst subst@(Subst in_scope env tvs) old_id
   = (Subst (in_scope `extendInScopeSet` new_id) new_env tvs, new_id)
@@ -324,6 +325,7 @@ substIdBndr rec_subst subst@(Subst in_scope env tvs) old_id
        -- rec_subst, when dealing with a mutually-recursive group
     new_id = maybeModifyIdInfo mb_new_info id2
     mb_new_info = substIdInfo rec_subst (idInfo id2)
+       -- NB: unfolding info may be zapped
 
        -- Extend the substitution if the unique has changed
        -- See the notes with substTyVarBndr for the delVarEnv