#[allow(clippy::string_add, unused)]
#[warn(clippy::string_add_assign)]
fn main() {
// ignores assignment distinction
let mut x = String::new();
for _ in 1..3 {
x += ".";
}
let y = String::new();
let z = y + "...";
assert_eq!(&x, &z);
let mut x = 1;
x += 1;
assert_eq!(2, x);
}