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-rw-r--r--compiler/GHC/Tc/Deriv/Generate.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/GHC/Tc/Deriv/Generate.hs b/compiler/GHC/Tc/Deriv/Generate.hs
index 810c4c7a32..ab0bbd0c11 100644
--- a/compiler/GHC/Tc/Deriv/Generate.hs
+++ b/compiler/GHC/Tc/Deriv/Generate.hs
@@ -2759,7 +2759,7 @@ buildDataConInstArgEnv rep_tc rep_tc_args =
-- | Apply a substitution to all of the 'Type's contained in a 'DerivInstTys'.
-- See @Note [Instantiating field types in stock deriving]@ for why we need to
-- substitute into a 'DerivInstTys' in the first place.
-substDerivInstTys :: TCvSubst -> DerivInstTys -> DerivInstTys
+substDerivInstTys :: Subst -> DerivInstTys -> DerivInstTys
substDerivInstTys subst
dit@(DerivInstTys { dit_cls_tys = cls_tys, dit_tc_args = tc_args
, dit_rep_tc = rep_tc, dit_rep_tc_args = rep_tc_args })