mirror of https://github.com/rust-lang/rust.git
118 lines
2.3 KiB
Rust
118 lines
2.3 KiB
Rust
#![warn(clippy::clone_on_ref_ptr)]
|
|
#![allow(unused)]
|
|
|
|
use std::cell::RefCell;
|
|
use std::collections::HashSet;
|
|
use std::collections::VecDeque;
|
|
use std::rc::{self, Rc};
|
|
use std::sync::{self, Arc};
|
|
|
|
trait SomeTrait {}
|
|
struct SomeImpl;
|
|
impl SomeTrait for SomeImpl {}
|
|
|
|
fn main() {}
|
|
|
|
fn clone_on_copy() {
|
|
42.clone();
|
|
|
|
vec![1].clone(); // ok, not a Copy type
|
|
Some(vec![1]).clone(); // ok, not a Copy type
|
|
(&42).clone();
|
|
|
|
let rc = RefCell::new(0);
|
|
rc.borrow().clone();
|
|
}
|
|
|
|
fn clone_on_ref_ptr() {
|
|
let rc = Rc::new(true);
|
|
let arc = Arc::new(true);
|
|
|
|
let rcweak = Rc::downgrade(&rc);
|
|
let arc_weak = Arc::downgrade(&arc);
|
|
|
|
rc.clone();
|
|
Rc::clone(&rc);
|
|
|
|
arc.clone();
|
|
Arc::clone(&arc);
|
|
|
|
rcweak.clone();
|
|
rc::Weak::clone(&rcweak);
|
|
|
|
arc_weak.clone();
|
|
sync::Weak::clone(&arc_weak);
|
|
|
|
let x = Arc::new(SomeImpl);
|
|
let _: Arc<dyn SomeTrait> = x.clone();
|
|
}
|
|
|
|
fn clone_on_copy_generic<T: Copy>(t: T) {
|
|
t.clone();
|
|
|
|
Some(t).clone();
|
|
}
|
|
|
|
fn clone_on_double_ref() {
|
|
let x = vec![1];
|
|
let y = &&x;
|
|
let z: &Vec<_> = y.clone();
|
|
|
|
println!("{:p} {:p}", *y, z);
|
|
}
|
|
|
|
fn iter_clone_collect() {
|
|
let v = [1, 2, 3, 4, 5];
|
|
let v2: Vec<isize> = v.iter().cloned().collect();
|
|
let v3: HashSet<isize> = v.iter().cloned().collect();
|
|
let v4: VecDeque<isize> = v.iter().cloned().collect();
|
|
|
|
// Handle macro expansion in suggestion
|
|
let _: Vec<isize> = vec![1, 2, 3].iter().cloned().collect();
|
|
|
|
// Issue #3704
|
|
unsafe {
|
|
let _: Vec<u8> = std::ffi::CStr::from_ptr(std::ptr::null())
|
|
.to_bytes()
|
|
.iter()
|
|
.cloned()
|
|
.collect();
|
|
}
|
|
}
|
|
|
|
mod many_derefs {
|
|
struct A;
|
|
struct B;
|
|
struct C;
|
|
struct D;
|
|
#[derive(Copy, Clone)]
|
|
struct E;
|
|
|
|
macro_rules! impl_deref {
|
|
($src:ident, $dst:ident) => {
|
|
impl std::ops::Deref for $src {
|
|
type Target = $dst;
|
|
fn deref(&self) -> &Self::Target {
|
|
&$dst
|
|
}
|
|
}
|
|
};
|
|
}
|
|
|
|
impl_deref!(A, B);
|
|
impl_deref!(B, C);
|
|
impl_deref!(C, D);
|
|
impl std::ops::Deref for D {
|
|
type Target = &'static E;
|
|
fn deref(&self) -> &Self::Target {
|
|
&&E
|
|
}
|
|
}
|
|
|
|
fn go1() {
|
|
let a = A;
|
|
let _: E = a.clone();
|
|
let _: E = *****a;
|
|
}
|
|
}
|