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{-# OPTIONS_GHC -Wincomplete-patterns -fforce-recomp #-}
{-# LANGUAGE PatternSynonyms #-}
{-# LANGUAGE ViewPatterns #-}
module T19475 where
class C f where
foo :: f a -> ()
pattern P :: C f => f a
pattern P <- (foo -> ())
{-# COMPLETE P #-}
class D f where
bar :: f a -> ()
pattern Q :: D f => f a
pattern Q <- (bar -> ())
g :: D f => f a -> ()
g Q = () -- Warning should not suggest P!
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