FsCheck v3 breaking API, how to use in F#

fscheck3.fsx

#r "nuget: FsCheck, version=3.0.0-beta1"

open FsCheck
open FsCheck.FSharp

let revRev xs = xs |> List.rev |> List.rev = xs

Check.QuickThrowOnFailure revRev

type Tree<'a> = Branch of Tree<'a> * Tree<'a> | Leaf of 'a
let rec reverse = 
    function
    | Leaf x -> Leaf x
    | Branch (l,r) -> Branch (reverse r, reverse l)

let revRevTree t = t |> reverse |> reverse = t
Check.QuickThrowOnFailure revRevTree

//So how do you provide catered data in the form of Gen and Arb?
let evens = 
    [for x in [1..100] do if x % 2 = 0 then yield x] 
    |> Gen.elements
    |> Arb.fromGen
let isEven n = n % 2 = 0
let allEvensAreEven = Prop.forAll evens isEven

Check.QuickThrowOnFailure allEvensAreEven