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{- This test checks that specialiations can apply inside
wrappers. In particular, the wrapper for 'foo' should
look like
Tmpl= \ (n_aal [Occ=Once!] :: GHC.Types.Int) ->
case n_aal of _ { GHC.Types.I# ipv_smZ [Occ=Once] ->
case Roman.foo_$s$wgo ipv_smZ 6 of ww_spp { __DEFAULT ->
GHC.Types.I# ww_spp
}
}}]
Note the $s$wgo. That in turn allows $wgo to be dead code.
-}
module Roman where
foo :: Int -> Int
foo n = n `seq` go (Just n) (Just (6::Int))
where
go u (Just x)
= x `seq`
case u of
Nothing -> go (Just 10) (Just m)
Just n
| n <= 0 -> 0
| n < 100 -> go (Just (n-2)) (Just x)
| n < 500 -> go (Just (n-3)) (Just m)
| otherwise -> go (Just (n-1)) (Just (m+m))
where
m = x+x+x+x+x+x+x
|
