mirror of
https://github.com/rust-lang/rust
synced 2024-09-30 22:04:36 +00:00
d68f2a6b71
```
error[E0382]: use of moved value: `t`
--> $DIR/use_of_moved_value_copy_suggestions.rs:7:9
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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
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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
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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;
| +
```
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85 lines
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Plaintext
warning: byte slice in a packed struct that derives a built-in trait
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--> $DIR/deriving-with-repr-packed.rs:31:5
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LL | #[derive(Debug)]
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| ----- in this derive macro expansion
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...
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LL | data: [u8],
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| ^^^^^^^^^^
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= warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
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= note: for more information, see issue #107457 <https://github.com/rust-lang/rust/issues/107457>
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= help: consider implementing the trait by hand, or remove the `packed` attribute
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= note: `#[warn(byte_slice_in_packed_struct_with_derive)]` on by default
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= note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
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warning: string slice in a packed struct that derives a built-in trait
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--> $DIR/deriving-with-repr-packed.rs:41:5
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LL | #[derive(Debug)]
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| ----- in this derive macro expansion
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...
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LL | data: str,
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| ^^^^^^^^^
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= warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
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= note: for more information, see issue #107457 <https://github.com/rust-lang/rust/issues/107457>
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= help: consider implementing the trait by hand, or remove the `packed` attribute
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= note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
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error[E0507]: cannot move out of `self` which is behind a shared reference
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--> $DIR/deriving-with-repr-packed.rs:22:10
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LL | #[derive(Debug, Default)]
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| ----- in this derive macro expansion
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LL | #[repr(packed)]
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LL | struct X(Y);
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| ^ move occurs because `self.0` has type `Y`, which does not implement the `Copy` trait
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note: if `Y` implemented `Clone`, you could clone the value
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--> $DIR/deriving-with-repr-packed.rs:16:1
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LL | struct Y(usize);
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| ^^^^^^^^ consider implementing `Clone` for this type
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...
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LL | struct X(Y);
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| - you could clone this value
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= note: `#[derive(Debug)]` triggers a move because taking references to the fields of a packed struct is undefined behaviour
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= note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
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error: aborting due to 1 previous error; 2 warnings emitted
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For more information about this error, try `rustc --explain E0507`.
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Future incompatibility report: Future breakage diagnostic:
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warning: byte slice in a packed struct that derives a built-in trait
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--> $DIR/deriving-with-repr-packed.rs:31:5
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LL | #[derive(Debug)]
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| ----- in this derive macro expansion
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...
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LL | data: [u8],
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| ^^^^^^^^^^
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= warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
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= note: for more information, see issue #107457 <https://github.com/rust-lang/rust/issues/107457>
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= help: consider implementing the trait by hand, or remove the `packed` attribute
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= note: `#[warn(byte_slice_in_packed_struct_with_derive)]` on by default
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= note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
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Future breakage diagnostic:
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warning: string slice in a packed struct that derives a built-in trait
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--> $DIR/deriving-with-repr-packed.rs:41:5
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LL | #[derive(Debug)]
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| ----- in this derive macro expansion
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...
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LL | data: str,
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| ^^^^^^^^^
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= warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
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= note: for more information, see issue #107457 <https://github.com/rust-lang/rust/issues/107457>
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= help: consider implementing the trait by hand, or remove the `packed` attribute
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= note: `#[warn(byte_slice_in_packed_struct_with_derive)]` on by default
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= note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info)
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