Function extern_spec_ShrAssign_u64_u128_shr_assign 

pub fn extern_spec_ShrAssign_u64_u128_shr_assign(self_: &mut u128, rhs: u64)

extern spec for u128::shr_assign

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

requires

(0usize as $rhs) <= rhs && rhs < $type::BITS as $rhs

ensures

^self == *self $op rhs