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|
{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE PatternSynonyms #-}
module T17340 where
data A = A { a :: () }
data B = B
newtype C = C Int
pattern P = B
f_nowarn :: Bool -> Bool
f_nowarn !x = x
f :: Bool -> Bool
f True = False
f !x = x
g :: (Int, Int) -> Bool -> ()
g (a,b) True = ()
g !x False = ()
data T = MkT !Int
h :: T -> ()
h (MkT !x) = ()
k :: Bool -> Int
k True = 1
k !_ = 2 -- clause is accessible, so warn for the bang
t :: () -> Bool -> Int
t _ True = 1
t !() True = 2 -- the clause has inaccessible RHS, warn for the bang
t _ False = 3
q :: Bool -> Int
q True = 1
q !True = 2 -- clause is redundant, don't warn for the bang
q False = 3
i :: Bool -> Int
i True = 1
i !x | x = 2 -- redundant
| not x = 3 -- accessible. This one will stay alive, so warn for the bang
newtype T2 a = T2 a
w :: T2 a -> Bool -> ()
w _ True = ()
w (T2 _) True = () -- redundant
w !_ True = () -- inaccessible
w _ _ = ()
z :: T2 a -> Bool -> ()
z _ True = ()
z t2 !x | T2 _ <- t2, x = () -- redundant
| !_ <- t2, x = () -- inaccessible
|
