mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-11-15 09:27:25 +00:00
a5cdd4aeb1
"Redundant" clones of `ManuallyDrop` are sometimes used for the side effect of
invoking the clone, without running the drop implementation of the inner type.
In other words, they aren't really redundant. For example, futures-rs crate:
```rust
#[allow(clippy::redundant_clone)] // The clone here isn't actually redundant.
unsafe fn increase_refcount<T: ArcWake>(data: *const ()) {
// Retain Arc, but don't touch refcount by wrapping in ManuallyDrop
let arc = mem::ManuallyDrop::new(Arc::<T>::from_raw(data as *const T));
// Now increase refcount, but don't drop new refcount either
let _arc_clone: mem::ManuallyDrop<_> = arc.clone();
}
```
Ignore redundant clone lint for ManuallyDrop.
171 lines
4.6 KiB
Text
171 lines
4.6 KiB
Text
error: redundant clone
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--> $DIR/redundant_clone.rs:8:42
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LL | let _s = ["lorem", "ipsum"].join(" ").to_string();
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| ^^^^^^^^^^^^ help: remove this
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= note: `-D clippy::redundant-clone` implied by `-D warnings`
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note: this value is dropped without further use
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--> $DIR/redundant_clone.rs:8:14
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LL | let _s = ["lorem", "ipsum"].join(" ").to_string();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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error: redundant clone
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--> $DIR/redundant_clone.rs:11:15
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LL | let _s = s.clone();
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| ^^^^^^^^ help: remove this
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note: this value is dropped without further use
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--> $DIR/redundant_clone.rs:11:14
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LL | let _s = s.clone();
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| ^
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error: redundant clone
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--> $DIR/redundant_clone.rs:14:15
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LL | let _s = s.to_string();
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| ^^^^^^^^^^^^ help: remove this
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note: this value is dropped without further use
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--> $DIR/redundant_clone.rs:14:14
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LL | let _s = s.to_string();
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| ^
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error: redundant clone
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--> $DIR/redundant_clone.rs:17:15
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LL | let _s = s.to_owned();
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| ^^^^^^^^^^^ help: remove this
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note: this value is dropped without further use
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--> $DIR/redundant_clone.rs:17:14
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LL | let _s = s.to_owned();
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| ^
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error: redundant clone
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--> $DIR/redundant_clone.rs:19:42
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LL | let _s = Path::new("/a/b/").join("c").to_owned();
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| ^^^^^^^^^^^ help: remove this
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note: this value is dropped without further use
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--> $DIR/redundant_clone.rs:19:14
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LL | let _s = Path::new("/a/b/").join("c").to_owned();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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error: redundant clone
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--> $DIR/redundant_clone.rs:21:42
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LL | let _s = Path::new("/a/b/").join("c").to_path_buf();
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| ^^^^^^^^^^^^^^ help: remove this
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note: this value is dropped without further use
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--> $DIR/redundant_clone.rs:21:14
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LL | let _s = Path::new("/a/b/").join("c").to_path_buf();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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error: redundant clone
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--> $DIR/redundant_clone.rs:23:29
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LL | let _s = OsString::new().to_owned();
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| ^^^^^^^^^^^ help: remove this
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note: this value is dropped without further use
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--> $DIR/redundant_clone.rs:23:14
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LL | let _s = OsString::new().to_owned();
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| ^^^^^^^^^^^^^^^
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error: redundant clone
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--> $DIR/redundant_clone.rs:25:29
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LL | let _s = OsString::new().to_os_string();
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| ^^^^^^^^^^^^^^^ help: remove this
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note: this value is dropped without further use
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--> $DIR/redundant_clone.rs:25:14
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LL | let _s = OsString::new().to_os_string();
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| ^^^^^^^^^^^^^^^
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error: redundant clone
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--> $DIR/redundant_clone.rs:32:19
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LL | let _t = tup.0.clone();
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| ^^^^^^^^ help: remove this
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note: this value is dropped without further use
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--> $DIR/redundant_clone.rs:32:14
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LL | let _t = tup.0.clone();
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| ^^^^^
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error: redundant clone
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--> $DIR/redundant_clone.rs:62:22
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LL | (a.clone(), a.clone())
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| ^^^^^^^^ help: remove this
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note: this value is dropped without further use
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--> $DIR/redundant_clone.rs:62:21
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LL | (a.clone(), a.clone())
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| ^
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error: redundant clone
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--> $DIR/redundant_clone.rs:122:15
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LL | let _s = s.clone();
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| ^^^^^^^^ help: remove this
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note: this value is dropped without further use
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--> $DIR/redundant_clone.rs:122:14
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LL | let _s = s.clone();
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| ^
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error: redundant clone
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--> $DIR/redundant_clone.rs:123:15
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LL | let _t = t.clone();
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| ^^^^^^^^ help: remove this
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note: this value is dropped without further use
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--> $DIR/redundant_clone.rs:123:14
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LL | let _t = t.clone();
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| ^
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error: redundant clone
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--> $DIR/redundant_clone.rs:133:19
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LL | let _f = f.clone();
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| ^^^^^^^^ help: remove this
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note: this value is dropped without further use
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--> $DIR/redundant_clone.rs:133:18
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LL | let _f = f.clone();
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| ^
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error: redundant clone
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--> $DIR/redundant_clone.rs:145:14
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LL | let y = x.clone().join("matthias");
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| ^^^^^^^^ help: remove this
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note: cloned value is neither consumed nor mutated
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--> $DIR/redundant_clone.rs:145:13
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LL | let y = x.clone().join("matthias");
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| ^^^^^^^^^
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error: aborting due to 14 previous errors
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