129 lines
4.4 KiB
Rust
129 lines
4.4 KiB
Rust
// run-rustfix
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#![feature(box_patterns, stmt_expr_attributes, yeet_expr)]
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#![allow(
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dead_code,
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ellipsis_inclusive_range_patterns,
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irrefutable_let_patterns,
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unreachable_patterns,
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unused_mut,
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unused_variables
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)]
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#![deny(unused_parens)]
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fn lint_on_top_level() {
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let (a) = 0; //~ ERROR unnecessary parentheses around pattern
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for (a) in 0..1 {} //~ ERROR unnecessary parentheses around pattern
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if let (a) = 0 {} //~ ERROR unnecessary parentheses around pattern
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while let (a) = 0 {} //~ ERROR unnecessary parentheses around pattern
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fn foo((a): u8) {} //~ ERROR unnecessary parentheses around pattern
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let _ = |(a): u8| 0; //~ ERROR unnecessary parentheses around pattern
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}
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fn no_lint_attr() {
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let _x = #[allow(dead_code)] (1 + 2);
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}
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fn no_lint_yeet() -> Result<(), ()> {
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#[allow(unreachable_code)]
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if (do yeet) {}
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Ok(())
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}
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fn no_lint_ops() {
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#![allow(unreachable_code, irrefutable_let_patterns)]
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if ((..{}) == ..{}) {}
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if (!return) {}
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loop { match (() = () = () = break {}) {} }
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while let () = (*&mut false |= true && return) {}
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}
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fn lint_break_if_not_followed_by_block() {
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#![allow(unreachable_code)]
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loop { if (break) {} } //~ ERROR unnecessary parentheses
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loop { if (break ({ println!("hello") })) {} } //~ ERROR unnecessary parentheses
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loop { if (break { println!("hello") }) {} }
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}
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// Don't lint in these cases (#64106).
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fn or_patterns_no_lint() {
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match Box::new(0) {
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box (0 | 1) => {} // Should not lint as `box 0 | 1` binds as `(box 0) | 1`.
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_ => {}
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}
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match 0 {
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x @ (0 | 1) => {} // Should not lint as `x @ 0 | 1` binds as `(x @ 0) | 1`.
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_ => {}
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}
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if let &(0 | 1) = &0 {} // Should also not lint.
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if let &mut (0 | 1) = &mut 0 {} // Same.
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fn foo((Ok(a) | Err(a)): Result<u8, u8>) {} // Doesn't parse if we remove parens for now.
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let _ = |(Ok(a) | Err(a)): Result<u8, u8>| 1; // `|Ok(a) | Err(a)| 1` parses as bit-or.
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}
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fn or_patterns_will_lint() {
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if let (0 | 1) = 0 {} //~ ERROR unnecessary parentheses around pattern
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if let ((0 | 1),) = (0,) {} //~ ERROR unnecessary parentheses around pattern
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if let [(0 | 1)] = [0] {} //~ ERROR unnecessary parentheses around pattern
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if let 0 | (1 | 2) = 0 {} //~ ERROR unnecessary parentheses around pattern
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struct TS(u8);
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if let TS((0 | 1)) = TS(0) {} //~ ERROR unnecessary parentheses around pattern
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struct NS { f: u8 }
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if let NS { f: (0 | 1) } = (NS { f: 0 }) {} //~ ERROR unnecessary parentheses around pattern
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}
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// Don't lint on `&(mut x)` because `&mut x` means something else (#55342).
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fn deref_mut_binding_no_lint() {
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let &(mut x) = &0;
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}
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fn main() {
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match 1 {
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(_) => {} //~ ERROR unnecessary parentheses around pattern
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(y) => {} //~ ERROR unnecessary parentheses around pattern
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(ref r) => {} //~ ERROR unnecessary parentheses around pattern
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(e @ 1...2) => {} //~ ERROR unnecessary parentheses around pattern
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(1...2) => {} // Non ambiguous range pattern should not warn
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e @ (3...4) => {} // Non ambiguous range pattern should not warn
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}
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match &1 {
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(e @ &(1...2)) => {} //~ ERROR unnecessary parentheses around pattern
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&(_) => {} //~ ERROR unnecessary parentheses around pattern
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e @ &(1...2) => {} // Ambiguous range pattern should not warn
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&(1...2) => {} // Ambiguous range pattern should not warn
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}
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match &1 {
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e @ &(1...2) | e @ &(3...4) => {} // Complex ambiguous pattern should not warn
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&_ => {}
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}
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match 1 {
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(_) => {} //~ ERROR unnecessary parentheses around pattern
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(y) => {} //~ ERROR unnecessary parentheses around pattern
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(ref r) => {} //~ ERROR unnecessary parentheses around pattern
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(e @ 1..=2) => {} //~ ERROR unnecessary parentheses around pattern
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(1..=2) => {} // Non ambiguous range pattern should not warn
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e @ (3..=4) => {} // Non ambiguous range pattern should not warn
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}
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match &1 {
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(e @ &(1..=2)) => {} //~ ERROR unnecessary parentheses around pattern
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&(_) => {} //~ ERROR unnecessary parentheses around pattern
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e @ &(1..=2) => {} // Ambiguous range pattern should not warn
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&(1..=2) => {} // Ambiguous range pattern should not warn
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}
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match &1 {
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e @ &(1..=2) | e @ &(3..=4) => {} // Complex ambiguous pattern should not warn
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&_ => {}
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}
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}
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