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-rw-r--r--compiler/GHC/CoreToIface.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/GHC/CoreToIface.hs b/compiler/GHC/CoreToIface.hs
index 566900cdb4..81f4a17823 100644
--- a/compiler/GHC/CoreToIface.hs
+++ b/compiler/GHC/CoreToIface.hs
@@ -320,7 +320,7 @@ toIfaceCoercionX fr co
go_prov :: UnivCoProvenance -> IfaceUnivCoProv
go_prov (PhantomProv co) = IfacePhantomProv (go co)
go_prov (ProofIrrelProv co) = IfaceProofIrrelProv (go co)
- go_prov (PluginProv str) = IfacePluginProv str
+ go_prov (PluginProv str) = IfacePluginProv (mkFastString str)
go_prov (CorePrepProv b) = IfaceCorePrepProv b
toIfaceTcArgs :: TyCon -> [Type] -> IfaceAppArgs