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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.
79 lines
2.7 KiB
Plaintext
79 lines
2.7 KiB
Plaintext
error[E0382]: use of moved value
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--> $DIR/issue-83760.rs:10:20
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LL | while let Some(foo) = val {
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| ^^^ value moved here, in previous iteration of loop
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LL | if true {
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LL | val = None;
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| ---------- this reinitialization might get skipped
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= note: move occurs because value has type `Struct`, which does not implement the `Copy` trait
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help: borrow this binding in the pattern to avoid moving the value
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LL | while let Some(ref foo) = val {
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| +++
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error[E0382]: use of moved value: `foo`
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--> $DIR/issue-83760.rs:26:14
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LL | let mut foo = Some(Struct);
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| ------- move occurs because `foo` has type `Option<Struct>`, which does not implement the `Copy` trait
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LL | let _x = foo.unwrap();
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| -------- `foo` moved due to this method call
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LL | if true {
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LL | foo = Some(Struct);
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| ------------------ this reinitialization might get skipped
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...
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LL | let _y = foo;
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| ^^^ value used here after move
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note: `Option::<T>::unwrap` takes ownership of the receiver `self`, which moves `foo`
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--> $SRC_DIR/core/src/option.rs:LL:COL
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help: you could `clone` the value and consume it, if the `Struct: Clone` trait bound could be satisfied
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LL | let _x = foo.clone().unwrap();
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| ++++++++
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help: consider annotating `Struct` with `#[derive(Clone)]`
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LL + #[derive(Clone)]
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LL | struct Struct;
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error[E0382]: use of moved value: `foo`
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--> $DIR/issue-83760.rs:42:14
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LL | let mut foo = Some(Struct2);
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| ------- move occurs because `foo` has type `Option<Struct2>`, which does not implement the `Copy` trait
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LL | let _x = foo.unwrap();
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| -------- `foo` moved due to this method call
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...
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LL | let _y = foo;
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| ^^^ value used here after move
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note: these 3 reinitializations and 1 other might get skipped
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--> $DIR/issue-83760.rs:35:9
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LL | foo = Some(Struct2);
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| ^^^^^^^^^^^^^^^^^^^
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LL | } else if true {
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LL | foo = Some(Struct2);
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| ^^^^^^^^^^^^^^^^^^^
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LL | } else if true {
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LL | foo = Some(Struct2);
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| ^^^^^^^^^^^^^^^^^^^
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note: `Option::<T>::unwrap` takes ownership of the receiver `self`, which moves `foo`
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--> $SRC_DIR/core/src/option.rs:LL:COL
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help: you could `clone` the value and consume it, if the `Struct2: Clone` trait bound could be satisfied
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LL | let _x = foo.clone().unwrap();
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| ++++++++
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help: consider annotating `Struct2` with `#[derive(Clone)]`
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LL + #[derive(Clone)]
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LL | struct Struct2;
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error: aborting due to 3 previous errors
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For more information about this error, try `rustc --explain E0382`.
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