3 files changed, 16 insertions, 12 deletions
diff --git a/haddock-api/src/Haddock/Backends/Hoogle.hs b/haddock-api/src/Haddock/Backends/Hoogle.hs
index 29c64a2d..221580cc 100644
--- a/haddock-api/src/Haddock/Backends/Hoogle.hs
+++ b/haddock-api/src/Haddock/Backends/Hoogle.hs
@@ -87,7 +87,7 @@ dropHsDocTy = drop_sig_ty
         drop_ty (HsFunTy x w a b) = HsFunTy x w (drop_lty a) (drop_lty b)
         drop_ty (HsListTy x a) = HsListTy x (drop_lty a)
         drop_ty (HsTupleTy x a b) = HsTupleTy x a (map drop_lty b)
-        drop_ty (HsOpTy x a b c) = HsOpTy x (drop_lty a) b (drop_lty c)
+        drop_ty (HsOpTy x p a b c) = HsOpTy x p (drop_lty a) b (drop_lty c)
         drop_ty (HsParTy x a) = HsParTy x (drop_lty a)
         drop_ty (HsKindSig x a b) = HsKindSig x (drop_lty a) b
         drop_ty (HsDocTy _ a _) = drop_ty $ unL a
diff --git a/haddock-api/src/Haddock/Backends/LaTeX.hs b/haddock-api/src/Haddock/Backends/LaTeX.hs
index eb524ec7..349c6e8e 100644
--- a/haddock-api/src/Haddock/Backends/LaTeX.hs
+++ b/haddock-api/src/Haddock/Backends/LaTeX.hs
@@ -24,7 +24,7 @@ import Haddock.GhcUtils
 import GHC.Utils.Ppr hiding (Doc, quote)
 import qualified GHC.Utils.Ppr as Pretty
 
-import GHC.Types.Basic        ( PromotionFlag(..) )
+import GHC.Types.Basic        ( PromotionFlag(..), isPromoted )
 import GHC hiding (fromMaybeContext )
 import GHC.Types.Name.Occurrence
 import GHC.Types.Name        ( nameOccName )
@@ -1133,9 +1133,13 @@ ppr_mono_ty (HsAppTy _ fun_ty arg_ty) unicode
 ppr_mono_ty (HsAppKindTy _ fun_ty arg_ki) unicode
   = hsep [ppr_mono_lty fun_ty unicode, atSign unicode <> ppr_mono_lty arg_ki unicode]
 
-ppr_mono_ty (HsOpTy _ ty1 op ty2) unicode
-  = ppr_mono_lty ty1 unicode <+> ppr_op <+> ppr_mono_lty ty2 unicode
+ppr_mono_ty (HsOpTy _ prom ty1 op ty2) unicode
+  = ppr_mono_lty ty1 unicode <+> ppr_op_prom <+> ppr_mono_lty ty2 unicode
   where
+    ppr_op_prom | isPromoted prom
+                = char '\'' <> ppr_op
+                | otherwise
+                = ppr_op
     ppr_op | isSymOcc (getOccName op) = ppLDocName op
            | otherwise = char '`' <> ppLDocName op <> char '`'
 
diff --git a/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs b/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs
index 336f23ac..a54bb0aa 100644
--- a/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs
+++ b/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs
@@ -1281,15 +1281,15 @@ ppr_mono_ty (HsAppKindTy _ fun_ty arg_ki) unicode qual _
   = hsep [ppr_mono_lty fun_ty unicode qual HideEmptyContexts
          , atSign unicode <> ppr_mono_lty arg_ki unicode qual HideEmptyContexts]
 
-ppr_mono_ty (HsOpTy _ ty1 op ty2) unicode qual _
-  = ppr_mono_lty ty1 unicode qual HideEmptyContexts <+> ppr_op <+> ppr_mono_lty ty2 unicode qual HideEmptyContexts
+ppr_mono_ty (HsOpTy _ prom ty1 op ty2) unicode qual _
+  = ppr_mono_lty ty1 unicode qual HideEmptyContexts <+> ppr_op_prom <+> ppr_mono_lty ty2 unicode qual HideEmptyContexts
   where
-    -- `(:)` is valid in type signature only as constructor to promoted list
-    -- and needs to be quoted in code so we explicitly quote it here too.
-    ppr_op
-        | (getOccString . getName . unL) op == ":" = promoQuote ppr_op'
-        | otherwise = ppr_op'
-    ppr_op' = ppLDocName qual Infix op
+    ppr_op_prom
+        | isPromoted prom
+        = promoQuote ppr_op
+        | otherwise
+        = ppr_op
+    ppr_op = ppLDocName qual Infix op
 
 ppr_mono_ty (HsParTy _ ty) unicode qual emptyCtxts
   = parens (ppr_mono_lty ty unicode qual emptyCtxts)