rust/tests/ui/lint/unused-parens-pinned-reference-patterns.rs at ffe1dba2fb6e6caa5d556e36a56c26461285a334 · P8L1/rust · GitHub

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//@ run-rustfix
//@ check-pass
//@ normalize-stderr: "warning: 9 warnings emitted\n\n" -> "warning: 9 warnings emitted\n"
#![feature(pin_ergonomics, mut_ref)]
#![allow(dead_code)]
#![warn(unused_parens)]

fn pinned_reference_patterns(
    pin_const: &pin const i32,
    pin_mut: &pin mut i32,
    nested_pin_const: &pin const &pin const i32,
) {
    let &pin const (_x) = pin_const;
    //~^ WARN unnecessary parentheses around pattern

    let &pin const (mut _x) = pin_const;
    //~^ WARN unnecessary parentheses around pattern

    let &pin const (mut _x @ _) = pin_const;
    //~^ WARN unnecessary parentheses around pattern

    let &pin mut (mut _x) = pin_mut;
    //~^ WARN unnecessary parentheses around pattern

    let &pin const (&pin const _x) = nested_pin_const;
    //~^ WARN unnecessary parentheses around pattern

    let &pin const (ref pin const _x) = pin_const;
    //~^ WARN unnecessary parentheses around pattern

    let &pin mut (ref pin mut _x) = pin_mut;
    //~^ WARN unnecessary parentheses around pattern

    let &pin const (mut ref pin const _x) = pin_const;
    //~^ WARN unnecessary parentheses around pattern

    let &pin mut (mut ref pin mut _x) = pin_mut;
    //~^ WARN unnecessary parentheses around pattern
}

fn pinned_or_patterns_are_still_ambiguous(pin_const: &pin const i32) {
    match pin_const {
        &pin const (0 | 1) => {}
        _ => {}
    }
}

fn plain_shared_reference_patterns_still_need_parens(shared: &i32) {
    let &(mut _x) = shared;

    let &(mut ref _x) = shared;

    let &(mut ref pin const _x) = shared;
}

fn main() {}