70 lines
1.8 KiB
Rust
70 lines
1.8 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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use std::borrow::Cow;
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#[allow(clippy::trivially_copy_pass_by_ref)]
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fn x(y: &i32) -> i32 {
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*y
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}
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#[warn(clippy::all, clippy::needless_borrow)]
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#[allow(unused_variables)]
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fn main() {
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let a = 5;
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let b = x(&a);
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let c = x(&&a);
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let s = &String::from("hi");
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let s_ident = f(&s); // should not error, because `&String` implements Copy, but `String` does not
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let g_val = g(&Vec::new()); // should not error, because `&Vec<T>` derefs to `&[T]`
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let vec = Vec::new();
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let vec_val = g(&vec); // should not error, because `&Vec<T>` derefs to `&[T]`
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h(&"foo"); // should not error, because the `&&str` is required, due to `&Trait`
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if let Some(ref cake) = Some(&5) {}
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let garbl = match 42 {
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44 => &a,
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45 => {
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println!("foo");
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&&a // FIXME: this should lint, too
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},
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46 => &&a,
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_ => panic!(),
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};
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}
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fn f<T: Copy>(y: &T) -> T {
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*y
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}
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fn g(y: &[u8]) -> u8 {
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y[0]
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}
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trait Trait {}
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impl<'a> Trait for &'a str {}
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fn h(_: &Trait) {}
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#[warn(clippy::needless_borrow)]
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#[allow(dead_code)]
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fn issue_1432() {
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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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let _ = v.iter().filter(|&ref a| a.is_empty());
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let _ = v.iter().filter(|&a| a.is_empty());
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}
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#[allow(dead_code)]
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#[warn(clippy::needless_borrow)]
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#[derive(Debug)]
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enum Foo<'a> {
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Str(&'a str),
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}
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