Function extern_spec_ShlAssign_i128_u64_shl_assign 

pub fn extern_spec_ShlAssign_i128_u64_shl_assign(self_: &mut u64, rhs: i128)

extern spec for u64::shl_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