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error: `#[derive(From)]` used on a struct with no fields
--> $DIR/deriving-from-wrong-target.rs:8:10
|
LL | #[derive(From)]
| ^^^^
LL |
LL | struct S1;
| ^^
|
= note: `#[derive(From)]` can only be used on structs with exactly one field
error: `#[derive(From)]` used on a struct with no fields
--> $DIR/deriving-from-wrong-target.rs:12:10
|
LL | #[derive(From)]
| ^^^^
LL |
LL | struct S2 {}
| ^^
|
= note: `#[derive(From)]` can only be used on structs with exactly one field
error: `#[derive(From)]` used on a struct with multiple fields
--> $DIR/deriving-from-wrong-target.rs:16:10
|
LL | #[derive(From)]
| ^^^^
LL |
LL | struct S3(u32, bool);
| ^^
|
= note: `#[derive(From)]` can only be used on structs with exactly one field
error: `#[derive(From)]` used on a struct with multiple fields
--> $DIR/deriving-from-wrong-target.rs:20:10
|
LL | #[derive(From)]
| ^^^^
LL |
LL | struct S4 {
| ^^
|
= note: `#[derive(From)]` can only be used on structs with exactly one field
error: `#[derive(From)]` used on an enum
--> $DIR/deriving-from-wrong-target.rs:27:10
|
LL | #[derive(From)]
| ^^^^
LL |
LL | enum E1 {}
| ^^
|
= note: `#[derive(From)]` can only be used on structs with exactly one field
error[E0277]: the size for values of type `T` cannot be known at compilation time
--> $DIR/deriving-from-wrong-target.rs:33:11
|
LL | struct SUnsizedField<T: ?Sized> {
| - this type parameter needs to be `Sized`
LL | last: T,
| ^ doesn't have a size known at compile-time
|
= help: unsized fn params are gated as an unstable feature
help: consider removing the `?Sized` bound to make the type parameter `Sized`
|
LL - struct SUnsizedField<T: ?Sized> {
LL + struct SUnsizedField<T> {
|
help: function arguments must have a statically known size, borrowed types always have a known size
|
LL | last: &T,
| +
error: aborting due to 6 previous errors
For more information about this error, try `rustc --explain E0277`.
|
