Function extern_spec_Sub_u128_u128_sub 

pub fn extern_spec_Sub_u128_u128_sub(self_: u128, rhs: u128) -> u128

extern spec for u128::sub

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

requires

$type::MIN@ <= self@ $op rhs@ && self@ $op rhs@ <= $type::MAX@

ensures

result@ == self@ $op rhs@