Use eqSpecPreds

diff --git a/compiler/typecheck/TcPat.lhs b/compiler/typecheck/TcPat.lhs
index 2501225..c860bfe 100644 (file)
--- a/compiler/typecheck/TcPat.lhs
+++ b/compiler/typecheck/TcPat.lhs
@@ -695,8 +695,7 @@ tcConPat penv (L con_span con_name) pat_ty arg_pats thing_inside
 
          else do   -- The general case, with existential, 
                     -- and local equality constraints
-       { let eq_preds = [mkEqPred (mkTyVarTy tv, ty) | (tv, ty) <- eq_spec]
-             theta'   = substTheta tenv (eq_preds ++ theta)
+       { let theta'   = substTheta tenv (eqSpecPreds eq_spec ++ theta)
                            -- order is *important* as we generate the list of
                            -- dictionary binders from theta'
              no_equalities = not (any isEqPred theta')