:: Monoid_a _ => _ a -package:Cabal-syntax -package:board-games -is:exact package:stack
Lifted version of "System.Exit.exitSuccess".
@since 0.1.9.0.
Lifted version of "System.Exit.exitFailure".
@since 0.1.9.0.
The identity of
mplus. It should also satisfy the equations
mzero >>= f = mzero
v >> mzero = mzero
The default definition is
mzero = empty
Retrieves the monad environment.