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-rw-r--r--compiler/stgSyn/StgLint.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/stgSyn/StgLint.hs b/compiler/stgSyn/StgLint.hs
index 5140a47233..90628f050d 100644
--- a/compiler/stgSyn/StgLint.hs
+++ b/compiler/stgSyn/StgLint.hs
@@ -490,7 +490,7 @@ mkAlgAltMsg3 :: DataCon -> [Id] -> MsgDoc
mkAlgAltMsg3 con alts
= vcat [
text "In some algebraic case alternative, number of arguments doesn't match constructor:",
- ppr con,
+ ppr con <+> parens (text "arity" <+> ppr (dataConRepArity con)),
ppr alts
]