diff options
Diffstat (limited to 'compiler/prelude/PrelRules.hs')
| -rw-r--r-- | compiler/prelude/PrelRules.hs | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/compiler/prelude/PrelRules.hs b/compiler/prelude/PrelRules.hs index f8b8f91bcc..7111c7b07a 100644 --- a/compiler/prelude/PrelRules.hs +++ b/compiler/prelude/PrelRules.hs @@ -474,12 +474,11 @@ shiftRule shift_op ; case e1 of _ | shift_len == 0 -> return e1 - | shift_len < 0 || wordSizeInBits dflags < shift_len - -> return (mkRuntimeErrorApp rUNTIME_ERROR_ID wordPrimTy - ("Bad shift length" ++ show shift_len)) -- Do the shift at type Integer, but shift length is Int Lit (LitNumber nt x t) + | 0 < shift_len + , shift_len <= wordSizeInBits dflags -> let op = shift_op dflags y = x `op` fromInteger shift_len in liftMaybe $ Just (Lit (mkLitNumberWrap dflags nt y t)) |