test-framework fails with next error:
Couldn't match expected type `StdGen'
with actual type `random-220.127.116.11:System.Random.StdGen'
Expected type: StdGen -> Int -> Prop
Actual type: random-18.104.22.168:System.Random.StdGen -> Int -> a0
In the return type of a call of `unGen'
In the third argument of `myTest', namely
`(unGen (property testable))'
some patch should be added (maybe also upstream)