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{-# LANGUAGE ImplicitParams #-}
{-# OPTIONS_GHC -dcore-lint #-}
import GHC.Stack
f1 :: (?loc :: CallStack) => CallStack
-- we can solve CallStacks in local functions from CallStacks
-- in the outer context
f1 = let y x = (?loc :: CallStack)
in y 0
main :: IO ()
main = do putStrLn $ prettyCallStack f1
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