blob: bc8c23c7b895a6c32a248ad3d858623f3fac2f0d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
#![feature(lazy_cell)]
#![deny(suspicious_double_ref_op, noop_method_call)]
use std::borrow::Borrow;
use std::ops::Deref;
struct PlainType<T>(T);
#[derive(Clone)]
struct CloneType<T>(T);
pub fn clone_on_double_ref() {
let x = vec![1];
let y = &&x;
let z: &Vec<_> = y.clone();
//~^ ERROR using `.clone()` on a double reference, which returns `&Vec<i32>`
println!("{:p} {:p}", *y, z);
}
use std::sync::LazyLock;
pub static STRS: LazyLock<&str> = LazyLock::new(|| "First");
// https://github.com/rust-lang/rust-clippy/issues/9272
fn rust_clippy_issue_9272() {
let str = STRS.clone();
println!("{str}")
}
fn main() {
let clone_type_ref = &&CloneType(1u32);
let clone_type_ref_clone: &CloneType<u32> = clone_type_ref.clone();
//~^ ERROR using `.clone()` on a double reference, which returns `&CloneType<u32>`
let non_deref_type = &&PlainType(1u32);
let non_deref_type_deref: &PlainType<u32> = non_deref_type.deref();
//~^ ERROR using `.deref()` on a double reference, which returns `&PlainType<u32>`
let xs = ["a", "b", "c"];
let _v: Vec<&str> = xs.iter().map(|x| x.clone()).collect(); // could use `*x` instead
//~^ ERROR using `.clone()` on a double reference, which returns `&str`
}
|
