pub trait ShlAssign<Rhs = Self> {
    // Required method
    fn shl_assign(&mut self, rhs: Rhs);
}Expand description
The left shift assignment operator <<=.
§Examples
An implementation of ShlAssign for a wrapper around usize.
use std::ops::ShlAssign;
#[derive(Debug, PartialEq)]
struct Scalar(usize);
impl ShlAssign<usize> for Scalar {
    fn shl_assign(&mut self, rhs: usize) {
        self.0 <<= rhs;
    }
}
let mut scalar = Scalar(4);
scalar <<= 2;
assert_eq!(scalar, Scalar(16));