From 8d260690b53f2fb6b54ba78bd13d1400d9ebd395 Mon Sep 17 00:00:00 2001
From: Richard Eisenberg <rae@richarde.dev>
Date: Sat, 7 Nov 2020 22:42:07 -0500
Subject: Avoid GHC#18932.

---
 haddock-api/src/Haddock/Convert.hs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'haddock-api')

diff --git a/haddock-api/src/Haddock/Convert.hs b/haddock-api/src/Haddock/Convert.hs
index 2a711e5c..5f9940fc 100644
--- a/haddock-api/src/Haddock/Convert.hs
+++ b/haddock-api/src/Haddock/Convert.hs
@@ -93,10 +93,11 @@ tyThingToLHsDecl prr t = case t of
            extractFamilyDecl _           =
              Left "tyThingToLHsDecl: impossible associated tycon"
 
+           cvt :: HsTyVarBndr flag (GhcPass p) -> HsType (GhcPass p)
+             -- Without this signature, we trigger GHC#18932
            cvt (UserTyVar _ _ n) = HsTyVar noExtField NotPromoted n
            cvt (KindedTyVar _ _ (L name_loc n) kind) = HsKindSig noExtField
               (L name_loc (HsTyVar noExtField NotPromoted (L name_loc n))) kind
-           cvt (XTyVarBndr nec) = noExtCon nec
 
            -- | Convert a LHsTyVarBndr to an equivalent LHsType.
            hsLTyVarBndrToType :: LHsTyVarBndr flag (GhcPass p) -> LHsType (GhcPass p)
-- 
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