A tuple enclosed in paren results in `double_parens` even if `unused_parens` is disabled.

Summary

When I disable unused_parens, clippy stops complaining about this code as expected:

match (a + b) {
    _ => todo!(),
}

However, when the expression is a tuple like in the code below, clippy instead starts saying this is double_parens.

match ((a, b)) {
    _ => todo!(),
}

I mark this issue as False Positive because:

• I feel some inconsistency here. To write a consistent code with the first code, I have to disable not only unused_parens but also double_parens, making clippy now overlook (((3))) + 4, return ((0)), etc.

• Just by seeing the examples shown in the documentation of double_parens, I think the original intention of the lint is not to detect the case shown in this issue.

Lint Name

double_parens

Reproducer

Source Code

fn main() {
    let a = 3;
    let b = 4;
    match ((a, b)) {
        _ => todo!(),
    }
}

Actual Output 1 (without --allow unused_parens)

$ RUSTFLAGS= cargo clippy

warning: unnecessary parentheses around `match` scrutinee expression
 --> src/main.rs:4:11
  |
4 |     match ((a, b)) {
  |           ^      ^
  |
  = note: `#[warn(unused_parens)]` on by default
help: remove these parentheses
  |
4 -     match ((a, b)) {
4 +     match (a, b) {
  |

warning: consider removing unnecessary double parentheses
 --> src/main.rs:4:11
  |
4 |     match ((a, b)) {
  |           ^^^^^^^^
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#double_parens
  = note: `#[warn(clippy::double_parens)]` on by default

Actual Output 2 (with --allow unused_parens)

$ RUSTFLAGS='--allow unused_parens' cargo clippy

warning: consider removing unnecessary double parentheses
 --> src/main.rs:4:11
  |
4 |     match ((a, b)) {
  |           ^^^^^^^^
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#double_parens
  = note: `#[warn(clippy::double_parens)]` on by default

Expected Output

$ RUSTFLAGS='--allow unused_parens' cargo clippy

(nothing shown)

Version

rustc 1.68.0 (2c8cc3432 2023-03-06)
binary: rustc
commit-hash: 2c8cc343237b8f7d5a3c3703e3a87f2eb2c54a74
commit-date: 2023-03-06
host: aarch64-apple-darwin
release: 1.68.0
LLVM version: 15.0.6

Additional Labels

No response

Start by running the provided match-expression reproducer with cargo clippy, both with and without --allow unused_parens. Inspect the double_parens and unused_parens lint behavior; done means the tuple case produces no warning when unused_parens is allowed without suppressing unrelated double-parentheses warnings.