System.Exit.Lens

These prisms can be used with the combinators in Control.Exception.Lens.

Documentation

class AsExitCode t where

Exit codes that a program can return with:

Methods

_ExitCode :: Prism' t ExitCode

Instances

AsExitCode ExitCode

Defined in System.Exit.Lens

Methods

_ExitCode :: Prism' ExitCode ExitCode

AsExitCode SomeException

Defined in System.Exit.Lens

Methods

_ExitCode :: Prism' SomeException ExitCode

_ExitFailure :: AsExitCode t => Prism' t Int

indicates program failure with an exit code. The exact interpretation of the code is operating-system dependent. In particular, some values may be prohibited (e.g. 0 on a POSIX-compliant system).

_ExitFailure :: Prism' ExitCode      Int
_ExitFailure :: Prism' SomeException Int

_ExitSuccess :: AsExitCode t => Prism' t ()

indicates successful termination;

_ExitSuccess :: Prism' ExitCode      ()
_ExitSuccess :: Prism' SomeException ()

pattern ExitFailure_ :: AsExitCode s => Int -> s

pattern ExitSuccess_ :: AsExitCode s => s