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-rw-r--r--compiler/GHC/Hs/Instances.hs2
1 files changed, 2 insertions, 0 deletions
diff --git a/compiler/GHC/Hs/Instances.hs b/compiler/GHC/Hs/Instances.hs
index 61cb81006b..99d627965d 100644
--- a/compiler/GHC/Hs/Instances.hs
+++ b/compiler/GHC/Hs/Instances.hs
@@ -166,6 +166,8 @@ deriving instance Data (ConDecl GhcPs)
deriving instance Data (ConDecl GhcRn)
deriving instance Data (ConDecl GhcTc)
+deriving instance Data ConDeclGADTPrefixPs
+
-- deriving instance DataIdLR p p => Data (TyFamInstDecl p)
deriving instance Data (TyFamInstDecl GhcPs)
deriving instance Data (TyFamInstDecl GhcRn)