rust/tests/ui/needless_borrowed_ref.rs

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// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
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#[warn(clippy::needless_borrowed_reference)]
#[allow(unused_variables)]
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fn main() {
let mut v = Vec::<String>::new();
let _ = v.iter_mut().filter(|&ref a| a.is_empty());
// ^ should be linted
let var = 3;
let thingy = Some(&var);
if let Some(&ref v) = thingy {
// ^ should be linted
}
let mut var2 = 5;
let thingy2 = Some(&mut var2);
if let Some(&mut ref mut v) = thingy2 {
// ^ should *not* be linted
// v is borrowed as mutable.
*v = 10;
}
if let Some(&mut ref v) = thingy2 {
// ^ should *not* be linted
// here, v is borrowed as immutable.
// can't do that:
//*v = 15;
}
}
#[allow(dead_code)]
enum Animal {
Cat(u64),
Dog(u64),
}
#[allow(unused_variables)]
#[allow(dead_code)]
fn foo(a: &Animal, b: &Animal) {
match (a, b) {
(&Animal::Cat(v), &ref k) | (&ref k, &Animal::Cat(v)) => (), // lifetime mismatch error if there is no '&ref'
// ^ and ^ should *not* be linted
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(&Animal::Dog(ref a), &Animal::Dog(_)) => (), // ^ should *not* be linted
}
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}