void-0.6.1: A Haskell 98 logically uninhabited data type

Portabilityportable
Stabilityprovisional
MaintainerEdward Kmett <ekmett@gmail.com>
Safe HaskellUnsafe

Data.Void.Unsafe

Description

 

Synopsis

Documentation

unsafeVacuous :: Functor f => f Void -> f a

If Void is uninhabited than any Functor that holds only values of the type Void is holding no values.

This is only safe for valid functors that do not perform GADT-like analysis on the argument.

unsafeVacuousM :: Monad m => m Void -> m a

If Void is uninhabited then any Monad that holds values of type Void is holding no values.

This is only safe for valid monads that do not perform GADT-like analysis on the argument.