rust/tests/ui/strings.rs

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#[warn(clippy::string_add)]
#[allow(clippy::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);
}
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#[warn(clippy::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);
}
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#[warn(clippy::string_add, clippy::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(clippy::assign_op_pattern)]
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);
}