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-rw-r--r--compiler/GHC/CmmToAsm/Wasm/FromCmm.hs4
1 files changed, 3 insertions, 1 deletions
diff --git a/compiler/GHC/CmmToAsm/Wasm/FromCmm.hs b/compiler/GHC/CmmToAsm/Wasm/FromCmm.hs
index 7ca323d72d..9a4c3f34c2 100644
--- a/compiler/GHC/CmmToAsm/Wasm/FromCmm.hs
+++ b/compiler/GHC/CmmToAsm/Wasm/FromCmm.hs
@@ -816,7 +816,9 @@ lower_CmmMachOp lbl (MO_SS_Conv w0 w1) xs = lower_MO_SS_Conv lbl w0 w1 xs
lower_CmmMachOp lbl (MO_UU_Conv w0 w1) xs = lower_MO_UU_Conv lbl w0 w1 xs
lower_CmmMachOp lbl (MO_XX_Conv w0 w1) xs = lower_MO_UU_Conv lbl w0 w1 xs
lower_CmmMachOp lbl (MO_FF_Conv w0 w1) xs = lower_MO_FF_Conv lbl w0 w1 xs
-lower_CmmMachOp _ _ _ = panic "lower_CmmMachOp: unreachable"
+lower_CmmMachOp _ mop _ =
+ pprPanic "lower_CmmMachOp: unreachable" $
+ vcat [ text "offending MachOp:" <+> pprMachOp mop ]
-- | Lower a 'CmmLit'. Note that we don't emit 'f32.const' or
-- 'f64.const' for the time being, and instead emit their relative bit