Function extern_spec_usize_checked_div 

pub fn extern_spec_usize_checked_div(self_: usize, rhs: usize) -> Option<usize>

extern spec for usize::checked_div

This is not a real function: its only use is for documentation.

terminates

ghost

ensures

(result == None) == (rhs@ == 0 || (self@ == $type::MIN@ && rhs@ == -1))

ensures

forall<r: $type> result == Some(r) ==> r@ == self@ / rhs@