8ded385ddc
* Lint when a borrow is auto dereferenced more than once * Lint when the expression is used as the expression of a block for a match arm Moves `needless_borrow` and `ref_binding_to_reference` to `dereference` lint pass in preperation for `explicit_auto_deref` lint.
72 lines
1.5 KiB
Rust
72 lines
1.5 KiB
Rust
// run-rustfix
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#[warn(clippy::all, clippy::needless_borrow)]
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#[allow(unused_variables, clippy::unnecessary_mut_passed)]
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fn main() {
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let a = 5;
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let ref_a = &a;
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let _ = x(&a); // no warning
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let _ = x(&&a); // warn
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let mut b = 5;
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mut_ref(&mut b); // no warning
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mut_ref(&mut &mut b); // warn
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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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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
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},
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46 => &&a,
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47 => {
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println!("foo");
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loop {
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println!("{}", a);
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if a == 25 {
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break &ref_a;
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}
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}
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},
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_ => panic!(),
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};
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let _ = x(&&&a);
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let _ = x(&mut &&a);
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let _ = x(&&&mut b);
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let _ = x(&&ref_a);
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{
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let b = &mut b;
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x(&b);
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}
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}
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#[allow(clippy::needless_borrowed_reference)]
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fn x(y: &i32) -> i32 {
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*y
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}
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fn mut_ref(y: &mut i32) {
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*y = 5;
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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(_: &dyn Trait) {}
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