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-rw-r--r--haddock-api/src/Haddock/Backends/Xhtml/Decl.hs7
1 files changed, 6 insertions, 1 deletions
diff --git a/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs b/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs
index d3900f16..5f6f60eb 100644
--- a/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs
+++ b/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs
@@ -892,7 +892,12 @@ ppr_mono_ty ctxt_prec (HsOpTy ty1 (_, op) ty2) unicode qual
= maybeParen ctxt_prec pREC_FUN $
ppr_mono_lty pREC_OP ty1 unicode qual <+> ppr_op <+> ppr_mono_lty pREC_OP ty2 unicode qual
where
- ppr_op = ppLDocName qual Infix op
+ -- `(:)` 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 . unLoc) op == ":" = promoQuote ppr_op'
+ | otherwise = ppr_op'
+ ppr_op' = ppLDocName qual Infix op
ppr_mono_ty ctxt_prec (HsParTy ty) unicode qual
-- = parens (ppr_mono_lty pREC_TOP ty)