mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-09-21 07:01:54 +00:00
58 lines
1.6 KiB
Rust
58 lines
1.6 KiB
Rust
// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#[warn(clippy::needless_borrowed_reference)]
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#[allow(unused_variables)]
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fn main() {
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let mut v = Vec::<String>::new();
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let _ = v.iter_mut().filter(|&ref a| a.is_empty());
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// ^ should be linted
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let var = 3;
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let thingy = Some(&var);
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if let Some(&ref v) = thingy {
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// ^ should be linted
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}
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let mut var2 = 5;
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let thingy2 = Some(&mut var2);
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if let Some(&mut ref mut v) = thingy2 {
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// ^ should *not* be linted
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// v is borrowed as mutable.
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*v = 10;
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}
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if let Some(&mut ref v) = thingy2 {
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// ^ should *not* be linted
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// here, v is borrowed as immutable.
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// can't do that:
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//*v = 15;
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}
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}
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#[allow(dead_code)]
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enum Animal {
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Cat(u64),
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Dog(u64),
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}
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#[allow(unused_variables)]
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#[allow(dead_code)]
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fn foo(a: &Animal, b: &Animal) {
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match (a, b) {
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(&Animal::Cat(v), &ref k) | (&ref k, &Animal::Cat(v)) => (), // lifetime mismatch error if there is no '&ref'
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// ^ and ^ should *not* be linted
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(&Animal::Dog(ref a), &Animal::Dog(_)) => ()
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// ^ should *not* be linted
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}
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}
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