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{-# LANGUAGE GADTs #-}
-- It's not clear whether this one should succeed or fail,
-- Arguably it should succeed because the type refinement on
-- T1 should make (y::Int). Currently, though, it fails.
module ShouldFail where
data T a where
T1 :: Int -> T Int
f :: (T a, a) -> Int
f ~(T1 x, y) = x+y
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