Function extern_spec_SubAssign__ref_u128_u128_sub_assign 

pub fn extern_spec_SubAssign__ref_u128_u128_sub_assign(
    self_: &mut u128,
    rhs: &u128,
)

extern spec for u128::sub_assign

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

requires

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

ensures

(^self)@ == self@ $op rhs@