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{-# LANGUAGE ImplicitParams, PartialTypeSignatures #-}
module Main where
import GHC.Stack
f1 :: (?loc :: CallStack) => String
f1 = show $ map (srcLocStartLine . snd) $ getCallStack ?loc
f2 :: (?loc :: CallStack) => _
f2 = show $ map (srcLocStartLine . snd) $ getCallStack ?loc
f3 :: (?loc :: CallStack, _) => String
f3 = show $ map (srcLocStartLine . snd) $ getCallStack ?loc
main :: IO ()
main = do
putStrLn f1
putStrLn f2
putStrLn f3
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