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{-# LANGUAGE LinearTypes #-}
{-# LANGUAGE UnicodeSyntax #-}
module Linear9 where
fst :: (a,b) -> a
fst (a,_) = a
incorrectFst :: (a,b) ⊸ a
incorrectFst (a,_) = a
incorrectFstVar :: (a,b) ⊸ a
incorrectFstVar (a,b) = a
incorrectFirstDup :: (a,b) ⊸ ((a,a),b)
incorrectFirstDup (a,b) = ((a,a),b)
incorrectFstFst :: ((a,b),c) ⊸ a
incorrectFstFst ((a,_),_) = a
data Test a
= Foo a a
| Bar a
incorrectTestFst :: Test a ⊸ a
incorrectTestFst (Foo a _) = a
incorrectTestFst (Bar a) = a
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