mirror of
https://github.com/rust-lang/rust
synced 2024-10-14 12:33:57 +00:00
98cfed7b97
When encountering a move error, look for implementations of `Clone` for the moved type. If there is one, check if all its obligations are met. If they are, we suggest cloning without caveats. If they aren't, we suggest cloning while mentioning the unmet obligations, potentially suggesting `#[derive(Clone)]` when appropriate. ``` error[E0507]: cannot move out of a shared reference --> $DIR/suggest-clone-when-some-obligation-is-unmet.rs:20:28 | LL | let mut copy: Vec<U> = map.clone().into_values().collect(); | ^^^^^^^^^^^ ------------- value moved due to this method call | | | move occurs because value has type `HashMap<T, U, Hash128_1>`, which does not implement the `Copy` trait | note: `HashMap::<K, V, S>::into_values` takes ownership of the receiver `self`, which moves value --> $SRC_DIR/std/src/collections/hash/map.rs:LL:COL help: you could `clone` the value and consume it, if the `Hash128_1: Clone` trait bound could be satisfied | LL | let mut copy: Vec<U> = <HashMap<T, U, Hash128_1> as Clone>::clone(&map.clone()).into_values().collect(); | ++++++++++++++++++++++++++++++++++++++++++++ + help: consider annotating `Hash128_1` with `#[derive(Clone)]` | LL + #[derive(Clone)] LL | pub struct Hash128_1; | ``` Fix #109429.
29 lines
1.3 KiB
Plaintext
29 lines
1.3 KiB
Plaintext
error[E0507]: cannot move out of `*cb` which is behind a mutable reference
|
|
--> $DIR/suggest-as-ref-on-mut-closure.rs:7:5
|
|
|
|
|
LL | cb.map(|cb| cb());
|
|
| ^^ -------------- `*cb` moved due to this method call
|
|
| |
|
|
| help: consider calling `.as_ref()` or `.as_mut()` to borrow the type's contents
|
|
| move occurs because `*cb` has type `Option<&mut dyn FnMut()>`, which does not implement the `Copy` trait
|
|
|
|
|
note: `Option::<T>::map` takes ownership of the receiver `self`, which moves `*cb`
|
|
--> $SRC_DIR/core/src/option.rs:LL:COL
|
|
help: you could `clone` the value and consume it, if the `&mut dyn FnMut(): Clone` trait bound could be satisfied
|
|
|
|
|
LL | <Option<&mut dyn FnMut()> as Clone>::clone(&cb).map(|cb| cb());
|
|
| ++++++++++++++++++++++++++++++++++++++++++++ +
|
|
|
|
error[E0596]: cannot borrow `*cb` as mutable, as it is behind a `&` reference
|
|
--> $DIR/suggest-as-ref-on-mut-closure.rs:12:26
|
|
|
|
|
LL | cb.as_ref().map(|cb| cb());
|
|
| -- ^^ `cb` is a `&` reference, so the data it refers to cannot be borrowed as mutable
|
|
| |
|
|
| consider changing this binding's type to be: `&mut &mut dyn FnMut()`
|
|
|
|
error: aborting due to 2 previous errors
|
|
|
|
Some errors have detailed explanations: E0507, E0596.
|
|
For more information about an error, try `rustc --explain E0507`.
|