Unsafe combinators for the
Gen monad.
Gen is only morally a monad: two generators that are supposed
to be equal will give the same probability distribution, but they
might be different as functions from random number seeds to values.
QuickCheck maintains the illusion that a
Gen is a probability
distribution and does not allow you to distinguish two generators that
have the same distribution.
The functions in this module allow you to break this illusion by
reusing the same random number seed twice. This is unsafe because by
applying the same seed to two morally equal generators, you can see
whether they are really equal or not.