mirror of
https://github.com/rust-lang/rust
synced 2024-10-14 20:46:49 +00:00
d68f2a6b71
```
error[E0382]: use of moved value: `t`
--> $DIR/use_of_moved_value_copy_suggestions.rs:7:9
|
LL | fn duplicate_t<T>(t: T) -> (T, T) {
| - move occurs because `t` has type `T`, which does not implement the `Copy` trait
...
LL | (t, t)
| - ^ value used here after move
| |
| value moved here
|
help: if `T` implemented `Clone`, you could clone the value
--> $DIR/use_of_moved_value_copy_suggestions.rs:4:16
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LL | fn duplicate_t<T>(t: T) -> (T, T) {
| ^ consider constraining this type parameter with `Clone`
...
LL | (t, t)
| - you could clone this value
help: consider restricting type parameter `T`
|
LL | fn duplicate_t<T: Copy>(t: T) -> (T, T) {
| ++++++
```
The `help` is new. On ADTs, we also extend the output with span labels:
```
error[E0507]: cannot move out of static item `FOO`
--> $DIR/issue-17718-static-move.rs:6:14
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LL | let _a = FOO;
| ^^^ move occurs because `FOO` has type `Foo`, which does not implement the `Copy` trait
|
note: if `Foo` implemented `Clone`, you could clone the value
--> $DIR/issue-17718-static-move.rs:1:1
|
LL | struct Foo;
| ^^^^^^^^^^ consider implementing `Clone` for this type
...
LL | let _a = FOO;
| --- you could clone this value
help: consider borrowing here
|
LL | let _a = &FOO;
| +
```
165 lines
5.3 KiB
Plaintext
165 lines
5.3 KiB
Plaintext
error[E0382]: use of moved value: `x`
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--> $DIR/binop-move-semantics.rs:8:5
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LL | fn double_move<T: Add<Output=()>>(x: T) {
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| - move occurs because `x` has type `T`, which does not implement the `Copy` trait
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LL | / x
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LL | | +
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LL | | x;
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| | ^
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| | |
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| |_____value used here after move
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| `x` moved due to usage in operator
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help: if `T` implemented `Clone`, you could clone the value
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--> $DIR/binop-move-semantics.rs:5:16
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LL | fn double_move<T: Add<Output=()>>(x: T) {
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| ^ consider constraining this type parameter with `Clone`
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LL | x
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| - you could clone this value
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note: calling this operator moves the left-hand side
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--> $SRC_DIR/core/src/ops/arith.rs:LL:COL
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help: consider further restricting this bound
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LL | fn double_move<T: Add<Output=()> + Copy>(x: T) {
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| ++++++
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error[E0382]: borrow of moved value: `x`
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--> $DIR/binop-move-semantics.rs:14:5
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LL | fn move_then_borrow<T: Add<Output=()> + Clone>(x: T) {
|
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| - move occurs because `x` has type `T`, which does not implement the `Copy` trait
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LL | x
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| - value moved here
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LL | +
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LL | x.clone();
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| ^ value borrowed here after move
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help: consider cloning the value if the performance cost is acceptable
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LL | x.clone()
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| ++++++++
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help: consider further restricting this bound
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LL | fn move_then_borrow<T: Add<Output=()> + Clone + Copy>(x: T) {
|
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| ++++++
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error[E0505]: cannot move out of `x` because it is borrowed
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--> $DIR/binop-move-semantics.rs:21:5
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LL | fn move_borrowed<T: Add<Output=()>>(x: T, mut y: T) {
|
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| - binding `x` declared here
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LL | let m = &x;
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| -- borrow of `x` occurs here
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...
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LL | x
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| ^ move out of `x` occurs here
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...
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LL | use_mut(n); use_imm(m);
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| - borrow later used here
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help: if `T` implemented `Clone`, you could clone the value
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--> $DIR/binop-move-semantics.rs:17:18
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LL | fn move_borrowed<T: Add<Output=()>>(x: T, mut y: T) {
|
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| ^ consider constraining this type parameter with `Clone`
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LL | let m = &x;
|
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| -- you could clone this value
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error[E0505]: cannot move out of `y` because it is borrowed
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--> $DIR/binop-move-semantics.rs:23:5
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LL | fn move_borrowed<T: Add<Output=()>>(x: T, mut y: T) {
|
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| ----- binding `y` declared here
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LL | let m = &x;
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LL | let n = &mut y;
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| ------ borrow of `y` occurs here
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...
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LL | y;
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| ^ move out of `y` occurs here
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LL | use_mut(n); use_imm(m);
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| - borrow later used here
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help: if `T` implemented `Clone`, you could clone the value
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--> $DIR/binop-move-semantics.rs:17:18
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LL | fn move_borrowed<T: Add<Output=()>>(x: T, mut y: T) {
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| ^ consider constraining this type parameter with `Clone`
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LL | let m = &x;
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LL | let n = &mut y;
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| ------ you could clone this value
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error[E0507]: cannot move out of `*m` which is behind a mutable reference
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--> $DIR/binop-move-semantics.rs:30:5
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LL | *m
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| -^
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| |
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| _____move occurs because `*m` has type `T`, which does not implement the `Copy` trait
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| |
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LL | | +
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LL | | *n;
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| |______- `*m` moved due to usage in operator
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note: calling this operator moves the left-hand side
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--> $SRC_DIR/core/src/ops/arith.rs:LL:COL
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help: if `T` implemented `Clone`, you could clone the value
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--> $DIR/binop-move-semantics.rs:26:24
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LL | fn illegal_dereference<T: Add<Output=()>>(mut x: T, y: T) {
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| ^ consider constraining this type parameter with `Clone`
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...
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LL | *m
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| -- you could clone this value
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error[E0507]: cannot move out of `*n` which is behind a shared reference
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--> $DIR/binop-move-semantics.rs:32:5
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LL | *n;
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| ^^ move occurs because `*n` has type `T`, which does not implement the `Copy` trait
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help: if `T` implemented `Clone`, you could clone the value
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--> $DIR/binop-move-semantics.rs:26:24
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LL | fn illegal_dereference<T: Add<Output=()>>(mut x: T, y: T) {
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| ^ consider constraining this type parameter with `Clone`
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...
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LL | *n;
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| -- you could clone this value
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error[E0502]: cannot borrow `f` as immutable because it is also borrowed as mutable
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--> $DIR/binop-move-semantics.rs:54:5
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LL | &mut f
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| ------
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| |
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| _____mutable borrow occurs here
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| |
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LL | | +
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LL | | &f;
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| | ^-
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| |_____||
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| |mutable borrow later used here
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| immutable borrow occurs here
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error[E0502]: cannot borrow `f` as mutable because it is also borrowed as immutable
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--> $DIR/binop-move-semantics.rs:62:5
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LL | &f
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| --
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| |
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| _____immutable borrow occurs here
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| |
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LL | | +
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LL | | &mut f;
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| | ^^^^^-
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| |_____|____|
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| | immutable borrow later used here
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| mutable borrow occurs here
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error: aborting due to 8 previous errors
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Some errors have detailed explanations: E0382, E0502, E0505, E0507.
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For more information about an error, try `rustc --explain E0382`.
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