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{-# OPTIONS_GHC -Wall -fwarn-tabs -Werror #-}
-- check that all warnings are emitted before failing due to -Werror (#1666)
-- missing type sig warning (type checker)
main = do
let main = main -- shadowing warning (renamer)
putStrLn "hello" -- tab warning (lexer)
f [] = []
f [] = [] -- overlapping pattern
-- incomplete pattern
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