rust-clippy/tests/ui/strings.rs

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#[warn(string_add)]
#[allow(string_add_assign)]
fn add_only() { // ignores assignment distinction
let mut x = "".to_owned();
for _ in 1..3 {
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x = x + ".";
}
let y = "".to_owned();
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let z = y + "...";
assert_eq!(&x, &z);
}
#[warn(string_add_assign)]
fn add_assign_only() {
let mut x = "".to_owned();
for _ in 1..3 {
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x = x + ".";
}
let y = "".to_owned();
let z = y + "...";
assert_eq!(&x, &z);
}
#[warn(string_add, string_add_assign)]
fn both() {
let mut x = "".to_owned();
for _ in 1..3 {
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x = x + ".";
}
let y = "".to_owned();
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let z = y + "...";
assert_eq!(&x, &z);
}
#[allow(dead_code, unused_variables)]
#[warn(string_lit_as_bytes)]
fn str_lit_as_bytes() {
let bs = "hello there".as_bytes();
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// no warning, because this cannot be written as a byte string literal:
let ubs = "".as_bytes();
let strify = stringify!(foobar).as_bytes();
}
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);
}