rust-clippy/tests/ui/match_on_vec_items.rs

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#![warn(clippy::match_on_vec_items)]
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fn match_with_wildcard() {
let arr = vec![0, 1, 2, 3];
let range = 1..3;
let idx = 1;
// Lint, may panic
match arr[idx] {
0 => println!("0"),
1 => println!("1"),
_ => {},
}
// Lint, may panic
match arr[range] {
[0, 1] => println!("0 1"),
[1, 2] => println!("1 2"),
_ => {},
}
}
fn match_without_wildcard() {
let arr = vec![0, 1, 2, 3];
let range = 1..3;
let idx = 2;
// Lint, may panic
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match arr[idx] {
0 => println!("0"),
1 => println!("1"),
num => {},
}
// Lint, may panic
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match arr[range] {
[0, 1] => println!("0 1"),
[1, 2] => println!("1 2"),
[ref sub @ ..] => {},
}
}
fn match_wildcard_and_action() {
let arr = vec![0, 1, 2, 3];
let range = 1..3;
let idx = 3;
// Lint, may panic
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match arr[idx] {
0 => println!("0"),
1 => println!("1"),
_ => println!("Hello, World!"),
}
// Lint, may panic
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match arr[range] {
[0, 1] => println!("0 1"),
[1, 2] => println!("1 2"),
_ => println!("Hello, World!"),
}
}
fn match_vec_ref() {
let arr = &vec![0, 1, 2, 3];
let range = 1..3;
let idx = 3;
// Lint, may panic
match arr[idx] {
0 => println!("0"),
1 => println!("1"),
_ => {},
}
// Lint, may panic
match arr[range] {
[0, 1] => println!("0 1"),
[1, 2] => println!("1 2"),
_ => {},
}
}
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fn match_with_get() {
let arr = vec![0, 1, 2, 3];
let range = 1..3;
let idx = 3;
// Ok
match arr.get(idx) {
Some(0) => println!("0"),
Some(1) => println!("1"),
_ => {},
}
// Ok
match arr.get(range) {
Some(&[0, 1]) => println!("0 1"),
Some(&[1, 2]) => println!("1 2"),
_ => {},
}
}
fn match_with_array() {
let arr = [0, 1, 2, 3];
let range = 1..3;
let idx = 3;
// Ok
match arr[idx] {
0 => println!("0"),
1 => println!("1"),
_ => {},
}
// Ok
match arr[range] {
[0, 1] => println!("0 1"),
[1, 2] => println!("1 2"),
_ => {},
}
}
fn match_with_endless_range() {
let arr = vec![0, 1, 2, 3];
let range = ..;
// Ok
match arr[range] {
[0, 1] => println!("0 1"),
[1, 2] => println!("1 2"),
[0, 1, 2, 3] => println!("0, 1, 2, 3"),
_ => {},
}
// Ok
match arr[..] {
[0, 1] => println!("0 1"),
[1, 2] => println!("1 2"),
[0, 1, 2, 3] => println!("0, 1, 2, 3"),
_ => {},
}
}
fn main() {
match_with_wildcard();
match_without_wildcard();
match_wildcard_and_action();
match_vec_ref();
match_with_get();
match_with_array();
match_with_endless_range();
}