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{-# LANGUAGE MagicHash #-}
module T4957 where
import GHC.Base
f :: Bool -> Int -> Int
f b 0 = 0
f b x = let y = case b of
True -> case f b (x-1) of
I# v -> I# (v -# 1#)
False -> case f b (x-1) of
I# v -> I# (v +# 1#)
in
case b of
True -> case y of
I# w -> I# (w -# 1#)
False -> case y of
I# w -> I# (w +# 1#)
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