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-rw-r--r--compiler/iface/MkIface.lhs6
1 files changed, 5 insertions, 1 deletions
diff --git a/compiler/iface/MkIface.lhs b/compiler/iface/MkIface.lhs
index f43cbd48fc..a04ce174ad 100644
--- a/compiler/iface/MkIface.lhs
+++ b/compiler/iface/MkIface.lhs
@@ -1339,9 +1339,13 @@ tyThingToIfaceDecl (AClass clas)
= classExtraBigSig clas
tycon = classTyCon clas
+ toIfaceAT :: ClassATItem -> IfaceAT
toIfaceAT (tc, def_tcs)
= IfaceAT (tyThingToIfaceDecl (ATyCon tc))
- (fmap (map (tyThingToIfaceDecl . ATyCon)) def_tcs)
+ (fmap (map to_if_at_def) def_tcs)
+ where
+ to_if_at_def (tvs, pat_tys, ty)
+ = (toIfaceTvBndrs tvs, map toIfaceType pat_tys, toIfaceType ty)
toIfaceClassOp (sel_id, def_meth)
= ASSERT(sel_tyvars == clas_tyvars)