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{-# LANGUAGE GADTs #-}
{-# LANGUAGE PatternSynonyms #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TypeInType #-}
{-# LANGUAGE TypeOperators #-}
{-# OPTIONS_GHC -Wincomplete-patterns #-}
module T14059a where
data SBool (z :: Bool) where
SFalse :: SBool False
STrue :: SBool True
pattern STooGoodToBeTrue :: forall (z :: Bool). ()
=> z ~ True
=> SBool z
pattern STooGoodToBeTrue = STrue
{-# COMPLETE SFalse, STooGoodToBeTrue #-}
wibble :: SBool z -> Bool
wibble STrue = True
wobble :: SBool z -> Bool
wobble STooGoodToBeTrue = True
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