Created
May 14, 2021 11:29
-
-
Save Garciat/ad611c97f05881becdb4a98329e734d3 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| import Control.Exception | |
| import System.IO.Unsafe | |
| match :: (a -> b) -> a -> Maybe b | |
| match m a = unsafeDupablePerformIO $ | |
| handle (\(PatternMatchFail _) -> pure Nothing) $ do | |
| x <- evaluate (m a) | |
| return (Just x) | |
| what :: Either a b -> Maybe b | |
| what = match (\case Right x -> x) |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment