trait definition of Step has changed in core in nightly rust 1.85

[tionway]

the definition of function steps_between changed from

 fn steps_between(start: &Self, end: &Self) -> Option<usize>;

to

fn steps_between(start: &Self, end: &Self) -> (usize, Option<usize>);

hence a changed is required to make compilation work in nightly channel

[Freax13]

Duplicate of #512