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-rw-r--r--compiler/iface/BuildTyCl.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/iface/BuildTyCl.hs b/compiler/iface/BuildTyCl.hs
index d13d38e6ff..1b4017abdc 100644
--- a/compiler/iface/BuildTyCl.hs
+++ b/compiler/iface/BuildTyCl.hs
@@ -184,7 +184,7 @@ buildPatSyn src_name declared_infix matcher@(matcher_id,_) builder
-- compatible with the pattern synonym
ASSERT2((and [ univ_tvs `equalLength` univ_tvs1
, ex_tvs `equalLength` ex_tvs1
- , pat_ty `eqType` substTyUnchecked subst pat_ty1
+ , pat_ty `eqType` substTy subst pat_ty1
, prov_theta `eqTypes` substTys subst prov_theta1
, req_theta `eqTypes` substTys subst req_theta1
, arg_tys `eqTypes` substTys subst arg_tys1