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import Control.Exception
-- This is just like T13380d, but doesn't look through the IO abstraction.
-- With Nested CPR, it will result in very similar code, however!
-- | An IO action that throws a precise exception that isn't inlined.
throws :: IO ()
throws = throwIO (userError "What")
{-# NOINLINE throws #-}
{-# NOINLINE f #-}
f :: Int -> Int -> IO Int
-- à la #13380
f x y | x>0 = throws >> return 0
| y>0 = return 1
| otherwise = return 2
main = f 2 undefined >>= print
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