Function extern_spec_ShlAssign__ref_u64_u8_shl_assign 

pub fn extern_spec_ShlAssign__ref_u64_u8_shl_assign(self_: &mut u8, rhs: &u64)

extern spec for u8::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