Shell.Utility.Exit

The Exit mechanism is not compositional and thus should not be used in larger long-running programs. However, in small command-line utilities and especially for signaling errors in command-line arguments it is acceptable.

The IO instance is useful for GetOpt and immediate exit. The Either instance is useful for eitherReader.

Documentation

class Applicative f => Exit f where

Methods

exitFailureMsg :: String -> f a

Also known as die in newer versions of base.

Instances

Exit IO

Defined in Shell.Utility.Exit

Methods

exitFailureMsg :: String -> IO a

IsString str => Exit (Either str)

Defined in Shell.Utility.Exit

Methods

exitFailureMsg :: String -> Either str a