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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.
28 lines
1.1 KiB
Plaintext
28 lines
1.1 KiB
Plaintext
error[E0382]: use of moved value: `foo`
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--> $DIR/as-ref-2.rs:10:14
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LL | let 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: Option<Struct> = foo.map(|s| bar(&s));
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| --- ---------------- `foo` moved due to this method call
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| |
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| help: consider calling `.as_ref()` or `.as_mut()` to borrow the type's contents
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LL | let _y = foo;
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| ^^^ value used here after move
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note: `Option::<T>::map` 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: Option<Struct> = foo.clone().map(|s| bar(&s));
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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: aborting due to 1 previous error
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For more information about this error, try `rustc --explain E0382`.
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