Function extern_spec_ShlAssign__ref_u16_u16_shl_assign 

pub fn extern_spec_ShlAssign__ref_u16_u16_shl_assign(self_: &mut u16, rhs: &u16)

extern spec for u16::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