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-rw-r--r--compiler/cmm/CmmOpt.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/cmm/CmmOpt.hs b/compiler/cmm/CmmOpt.hs
index 8d1641a7d4..38c399ebc4 100644
--- a/compiler/cmm/CmmOpt.hs
+++ b/compiler/cmm/CmmOpt.hs
@@ -79,7 +79,7 @@ cmmMachOpFoldM _ op [CmmLit (CmmInt x rep)]
MO_SS_Conv from to -> CmmLit (CmmInt (narrowS from x) to)
MO_UU_Conv from to -> CmmLit (CmmInt (narrowU from x) to)
- _ -> panic "cmmMachOpFoldM: unknown unary op"
+ _ -> panic $ "cmmMachOpFoldM: unknown unary op: " ++ show op
-- Eliminate conversion NOPs