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-rw-r--r--compiler/GHC/CoreToIface.hs2
1 files changed, 2 insertions, 0 deletions
diff --git a/compiler/GHC/CoreToIface.hs b/compiler/GHC/CoreToIface.hs
index 307dfd4893..3add18ff02 100644
--- a/compiler/GHC/CoreToIface.hs
+++ b/compiler/GHC/CoreToIface.hs
@@ -313,6 +313,8 @@ toIfaceCoercionX fr co
go_prov (PhantomProv co) = IfacePhantomProv (go co)
go_prov (ProofIrrelProv co) = IfaceProofIrrelProv (go co)
go_prov (PluginProv str) = IfacePluginProv str
+ go_prov CorePrepProv = pprPanic "toIfaceCoercionX" empty
+ -- CorePrepProv only happens after the iface file is generated
toIfaceTcArgs :: TyCon -> [Type] -> IfaceAppArgs
toIfaceTcArgs = toIfaceTcArgsX emptyVarSet