9a002e52e5
Add lint for reference to Cow to the same place in the code where lint for reference to String lives. https://github.com/rust-lang-nursery/rust-clippy/issues/2405
63 lines
1.3 KiB
Rust
63 lines
1.3 KiB
Rust
use std::borrow::Cow;
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fn x(y: &i32) -> i32 {
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*y
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}
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#[warn(clippy)]
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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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#[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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fn test_cow_with_ref(c: &Cow<[i32]>) {
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}
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#[allow(dead_code)]
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fn test_cow(c: Cow<[i32]>) {
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let _c = c;
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}
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