2020-01-25 05:25:45 +00:00
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#![warn(clippy::match_same_arms)]
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#![allow(clippy::blacklisted_name)]
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fn bar<T>(_: T) {}
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fn foo() -> bool {
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unimplemented!()
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}
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fn match_same_arms() {
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let _ = match 42 {
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42 => {
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foo();
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let mut a = 42 + [23].len() as i32;
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if true {
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a += 7;
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}
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a = -31 - a;
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a
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},
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_ => {
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//~ ERROR match arms have same body
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foo();
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let mut a = 42 + [23].len() as i32;
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if true {
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a += 7;
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}
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a = -31 - a;
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a
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},
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};
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let _ = match 42 {
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42 => foo(),
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51 => foo(), //~ ERROR match arms have same body
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_ => true,
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};
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let _ = match Some(42) {
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Some(_) => 24,
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None => 24, //~ ERROR match arms have same body
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};
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let _ = match Some(42) {
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Some(foo) => 24,
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None => 24,
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};
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let _ = match Some(42) {
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Some(42) => 24,
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Some(a) => 24, // bindings are different
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None => 0,
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};
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let _ = match Some(42) {
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Some(a) if a > 0 => 24,
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Some(a) => 24, // one arm has a guard
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None => 0,
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};
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match (Some(42), Some(42)) {
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(Some(a), None) => bar(a),
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(None, Some(a)) => bar(a), //~ ERROR match arms have same body
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_ => (),
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}
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match (Some(42), Some(42)) {
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(Some(a), ..) => bar(a),
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(.., Some(a)) => bar(a), //~ ERROR match arms have same body
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_ => (),
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}
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let _ = match Some(()) {
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Some(()) => 0.0,
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None => -0.0,
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};
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match (Some(42), Some("")) {
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(Some(a), None) => bar(a),
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(None, Some(a)) => bar(a), // bindings have different types
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_ => (),
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}
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2020-01-30 03:06:42 +00:00
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let x: Result<i32, &str> = Ok(3);
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// No warning because of the guard.
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match x {
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Ok(x) if x * x == 64 => println!("ok"),
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Ok(_) => println!("ok"),
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Err(_) => println!("err"),
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}
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// This used to be a false positive; see issue #1996.
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match x {
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Ok(3) => println!("ok"),
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Ok(x) if x * x == 64 => println!("ok 64"),
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Ok(_) => println!("ok"),
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Err(_) => println!("err"),
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}
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match (x, Some(1i32)) {
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(Ok(x), Some(_)) => println!("ok {}", x),
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(Ok(_), Some(x)) => println!("ok {}", x),
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_ => println!("err"),
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}
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// No warning; different types for `x`.
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match (x, Some(1.0f64)) {
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(Ok(x), Some(_)) => println!("ok {}", x),
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(Ok(_), Some(x)) => println!("ok {}", x),
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_ => println!("err"),
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}
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// False negative #2251.
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match x {
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Ok(_tmp) => println!("ok"),
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Ok(3) => println!("ok"),
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Ok(_) => println!("ok"),
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Err(_) => {
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unreachable!();
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},
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}
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2020-10-24 15:06:07 +00:00
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2021-03-04 16:06:24 +00:00
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// False positive #1390
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macro_rules! empty {
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($e:expr) => {};
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}
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match 0 {
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0 => {
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empty!(0);
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},
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1 => {
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empty!(1);
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},
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x => {
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empty!(x);
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},
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};
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// still lint if the tokens are the same
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match 0 {
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0 => {
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empty!(0);
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},
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1 => {
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empty!(0);
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},
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x => {
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empty!(x);
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},
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}
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2020-10-24 15:06:07 +00:00
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match_expr_like_matches_macro_priority();
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}
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fn match_expr_like_matches_macro_priority() {
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enum E {
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A,
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B,
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C,
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}
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let x = E::A;
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let _ans = match x {
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E::A => false,
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E::B => false,
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_ => true,
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};
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2020-01-25 05:25:45 +00:00
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}
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2022-02-17 18:43:59 +00:00
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fn main() {
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let _ = match Some(0) {
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Some(0) => 0,
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Some(1) => 1,
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#[cfg(feature = "foo")]
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Some(2) => 2,
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_ => 1,
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};
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2022-01-06 07:54:35 +00:00
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enum Foo {
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X(u32),
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Y(u32),
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Z(u32),
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}
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let _ = match Foo::X(0) {
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Foo::X(0) => 1,
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Foo::X(_) | Foo::Y(_) | Foo::Z(0) => 2,
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Foo::Z(_) => 1,
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_ => 0,
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};
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2022-02-17 18:43:59 +00:00
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}
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