rust/tests/compile-fail/strings.rs

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#![feature(plugin)]
#![plugin(clippy)]
#[deny(string_add)]
#[allow(string_add_assign)]
fn add_only() { // ignores assignment distinction
let mut x = "".to_owned();
for _ in 1..3 {
x = x + "."; //~ERROR you added something to a string.
}
let y = "".to_owned();
let z = y + "..."; //~ERROR you added something to a string.
assert_eq!(&x, &z);
}
#[deny(string_add_assign)]
fn add_assign_only() {
let mut x = "".to_owned();
for _ in 1..3 {
x = x + "."; //~ERROR you assigned the result of adding something to this string.
}
let y = "".to_owned();
let z = y + "...";
assert_eq!(&x, &z);
}
#[deny(string_add, string_add_assign)]
fn both() {
let mut x = "".to_owned();
for _ in 1..3 {
x = x + "."; //~ERROR you assigned the result of adding something to this string.
}
let y = "".to_owned();
let z = y + "..."; //~ERROR you added something to a string.
assert_eq!(&x, &z);
}
fn main() {
add_only();
add_assign_only();
both();
// the add is only caught for String
let mut x = 1;
x = x + 1;
assert_eq!(2, x);
}