testsuite/tests/typecheck/should_fail/TyAppPat_Nonmatching.hs


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{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE ExistentialQuantification #-}
{-# LANGUAGE ScopedTypeVariables #-}

module Main where

foo :: Maybe a -> a
foo (Just @Int x) = x
foo Nothing = 0

main = do
  print (foo (Just 5))