diff options
Diffstat (limited to 'tests/ui/derives')
| -rw-r--r-- | tests/ui/derives/deriving-copyclone.stderr | 24 | ||||
| -rw-r--r-- | tests/ui/derives/deriving-with-repr-packed-2.rs | 20 | ||||
| -rw-r--r-- | tests/ui/derives/deriving-with-repr-packed-2.stderr | 33 | ||||
| -rw-r--r-- | tests/ui/derives/deriving-with-repr-packed.rs | 53 | ||||
| -rw-r--r-- | tests/ui/derives/deriving-with-repr-packed.stderr | 138 |
5 files changed, 143 insertions, 125 deletions
diff --git a/tests/ui/derives/deriving-copyclone.stderr b/tests/ui/derives/deriving-copyclone.stderr index 9c4ca01ff..c0c2215c0 100644 --- a/tests/ui/derives/deriving-copyclone.stderr +++ b/tests/ui/derives/deriving-copyclone.stderr @@ -1,8 +1,8 @@ error[E0277]: the trait bound `B<C>: Copy` is not satisfied - --> $DIR/deriving-copyclone.rs:31:13 + --> $DIR/deriving-copyclone.rs:31:26 | LL | is_copy(B { a: 1, b: C }); - | ------- ^^^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `B<C>` + | ------- ^ the trait `Copy` is not implemented for `B<C>` | | | required by a bound introduced by this call | @@ -19,14 +19,14 @@ LL | fn is_copy<T: Copy>(_: T) {} = note: this error originates in the derive macro `Copy` (in Nightly builds, run with -Z macro-backtrace for more info) help: consider borrowing here | -LL | is_copy(&B { a: 1, b: C }); - | + +LL | is_copy(B { a: 1, b: &C }); + | + error[E0277]: the trait bound `B<C>: Clone` is not satisfied - --> $DIR/deriving-copyclone.rs:32:14 + --> $DIR/deriving-copyclone.rs:32:27 | LL | is_clone(B { a: 1, b: C }); - | -------- ^^^^^^^^^^^^^^^^ the trait `Clone` is not implemented for `B<C>` + | -------- ^ the trait `Clone` is not implemented for `B<C>` | | | required by a bound introduced by this call | @@ -43,14 +43,14 @@ LL | fn is_clone<T: Clone>(_: T) {} = note: this error originates in the derive macro `Clone` (in Nightly builds, run with -Z macro-backtrace for more info) help: consider borrowing here | -LL | is_clone(&B { a: 1, b: C }); - | + +LL | is_clone(B { a: 1, b: &C }); + | + error[E0277]: the trait bound `B<D>: Copy` is not satisfied - --> $DIR/deriving-copyclone.rs:35:13 + --> $DIR/deriving-copyclone.rs:35:26 | LL | is_copy(B { a: 1, b: D }); - | ------- ^^^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `B<D>` + | ------- ^ the trait `Copy` is not implemented for `B<D>` | | | required by a bound introduced by this call | @@ -67,8 +67,8 @@ LL | fn is_copy<T: Copy>(_: T) {} = note: this error originates in the derive macro `Copy` (in Nightly builds, run with -Z macro-backtrace for more info) help: consider borrowing here | -LL | is_copy(&B { a: 1, b: D }); - | + +LL | is_copy(B { a: 1, b: &D }); + | + error: aborting due to 3 previous errors diff --git a/tests/ui/derives/deriving-with-repr-packed-2.rs b/tests/ui/derives/deriving-with-repr-packed-2.rs new file mode 100644 index 000000000..79aca74df --- /dev/null +++ b/tests/ui/derives/deriving-with-repr-packed-2.rs @@ -0,0 +1,20 @@ +// Check that deriving certain builtin traits on certain packed structs cause +// errors. To avoid potentially misaligned references, field copies must be +// used, which involves adding `T: Copy` bounds. + +#[derive(Copy, Clone, Default, PartialEq, Eq)] +#[repr(packed)] +pub struct Foo<T>(T, T, T); + +struct NonCopy; + +fn main() { + // This one is fine because `u32` impls `Copy`. + let x: Foo<u32> = Foo(1, 2, 3); + _ = x.clone(); + + // This one is an error because `NonCopy` doesn't impl `Copy`. + let x: Foo<NonCopy> = Foo(NonCopy, NonCopy, NonCopy); + _ = x.clone(); + //~^ ERROR the method `clone` exists for struct `Foo<NonCopy>`, but its trait bounds were not satisfied +} diff --git a/tests/ui/derives/deriving-with-repr-packed-2.stderr b/tests/ui/derives/deriving-with-repr-packed-2.stderr new file mode 100644 index 000000000..ab3646057 --- /dev/null +++ b/tests/ui/derives/deriving-with-repr-packed-2.stderr @@ -0,0 +1,33 @@ +error[E0599]: the method `clone` exists for struct `Foo<NonCopy>`, but its trait bounds were not satisfied + --> $DIR/deriving-with-repr-packed-2.rs:18:11 + | +LL | pub struct Foo<T>(T, T, T); + | ----------------- + | | + | method `clone` not found for this struct + | doesn't satisfy `Foo<NonCopy>: Clone` +LL | +LL | struct NonCopy; + | -------------- + | | + | doesn't satisfy `NonCopy: Clone` + | doesn't satisfy `NonCopy: Copy` +... +LL | _ = x.clone(); + | ^^^^^ method cannot be called on `Foo<NonCopy>` due to unsatisfied trait bounds + | +note: the following trait bounds were not satisfied: + `NonCopy: Clone` + `NonCopy: Copy` + --> $DIR/deriving-with-repr-packed-2.rs:5:16 + | +LL | #[derive(Copy, Clone, Default, PartialEq, Eq)] + | ^^^^^ unsatisfied trait bound introduced in this `derive` macro +help: consider annotating `NonCopy` with `#[derive(Clone, Copy)]` + | +LL | #[derive(Clone, Copy)] + | + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0599`. diff --git a/tests/ui/derives/deriving-with-repr-packed.rs b/tests/ui/derives/deriving-with-repr-packed.rs index 3884e3977..58be45197 100644 --- a/tests/ui/derives/deriving-with-repr-packed.rs +++ b/tests/ui/derives/deriving-with-repr-packed.rs @@ -1,45 +1,46 @@ -#![deny(unaligned_references)] - // Check that deriving certain builtin traits on certain packed structs cause -// errors. This happens when the derived trait would need to use a potentially -// misaligned reference. But there are two cases that are allowed: -// - If all the fields within the struct meet the required alignment: 1 for -// `repr(packed)`, or `N` for `repr(packed(N))`. -// - If `Default` is the only trait derived, because it doesn't involve any -// references. +// errors. To avoid potentially misaligned references, field copies must be +// used, which involves adding `T: Copy` bounds. #[derive(Copy, Clone, Default, PartialEq, Eq)] -//~^ ERROR `Clone` can't be derived on this `#[repr(packed)]` struct with type or const parameters -//~| hard error -//~^^^ ERROR `PartialEq` can't be derived on this `#[repr(packed)]` struct with type or const parameters -//~| hard error #[repr(packed)] pub struct Foo<T>(T, T, T); +// This one is fine because the fields all impl `Copy`. #[derive(Default, Hash)] -//~^ ERROR `Hash` can't be derived on this `#[repr(packed)]` struct that does not derive `Copy` -//~| hard error #[repr(packed)] pub struct Bar(u32, u32, u32); -// This one is fine because the field alignment is 1. -#[derive(Default, Hash)] -#[repr(packed)] -pub struct Bar2(u8, i8, bool); - -// This one is fine because the field alignment is 2, matching `packed(2)`. -#[derive(Default, Hash)] -#[repr(packed(2))] -pub struct Bar3(u16, i16, bool); - // This one is fine because it's not packed. #[derive(Debug, Default)] struct Y(usize); +// This one has an error because `Y` doesn't impl `Copy`. +// Note: there is room for improvement in the error message. #[derive(Debug, Default)] -//~^ ERROR `Debug` can't be derived on this `#[repr(packed)]` struct that does not derive `Copy` -//~| hard error #[repr(packed)] struct X(Y); +//~^ ERROR cannot move out of `self` which is behind a shared reference + +// This is currently allowed, but will be phased out at some point. From +// `zerovec` within icu4x-0.9.0. +#[derive(Debug)] +#[repr(packed)] +struct FlexZeroSlice { + width: u8, + data: [u8], + //~^ WARNING byte slice in a packed struct that derives a built-in trait + //~^^ this was previously accepted +} + +// Again, currently allowed, but will be phased out. +#[derive(Debug)] +#[repr(packed)] +struct WithStr { + width: u8, + data: str, + //~^ WARNING string slice in a packed struct that derives a built-in trait + //~^^ this was previously accepted +} fn main() {} diff --git a/tests/ui/derives/deriving-with-repr-packed.stderr b/tests/ui/derives/deriving-with-repr-packed.stderr index 0ad800c39..0cfe03869 100644 --- a/tests/ui/derives/deriving-with-repr-packed.stderr +++ b/tests/ui/derives/deriving-with-repr-packed.stderr @@ -1,111 +1,75 @@ -error: `Clone` can't be derived on this `#[repr(packed)]` struct with type or const parameters - --> $DIR/deriving-with-repr-packed.rs:11:16 +warning: byte slice in a packed struct that derives a built-in trait + --> $DIR/deriving-with-repr-packed.rs:31:5 | -LL | #[derive(Copy, Clone, Default, PartialEq, Eq)] - | ^^^^^ +LL | #[derive(Debug)] + | ----- in this derive macro expansion +... +LL | data: [u8], + | ^^^^^^^^^^ | = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! - = note: for more information, see issue #82523 <https://github.com/rust-lang/rust/issues/82523> -note: the lint level is defined here - --> $DIR/deriving-with-repr-packed.rs:1:9 - | -LL | #![deny(unaligned_references)] - | ^^^^^^^^^^^^^^^^^^^^ - = note: this error originates in the derive macro `Clone` (in Nightly builds, run with -Z macro-backtrace for more info) - -error: `PartialEq` can't be derived on this `#[repr(packed)]` struct with type or const parameters - --> $DIR/deriving-with-repr-packed.rs:11:32 - | -LL | #[derive(Copy, Clone, Default, PartialEq, Eq)] - | ^^^^^^^^^ - | - = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! - = note: for more information, see issue #82523 <https://github.com/rust-lang/rust/issues/82523> - = note: this error originates in the derive macro `PartialEq` (in Nightly builds, run with -Z macro-backtrace for more info) + = note: for more information, see issue #107457 <https://github.com/rust-lang/rust/issues/107457> + = help: consider implementing the trait by hand, or remove the `packed` attribute + = note: `#[warn(byte_slice_in_packed_struct_with_derive)]` on by default + = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) -error: `Hash` can't be derived on this `#[repr(packed)]` struct that does not derive `Copy` - --> $DIR/deriving-with-repr-packed.rs:19:19 +warning: string slice in a packed struct that derives a built-in trait + --> $DIR/deriving-with-repr-packed.rs:41:5 | -LL | #[derive(Default, Hash)] - | ^^^^ +LL | #[derive(Debug)] + | ----- in this derive macro expansion +... +LL | data: str, + | ^^^^^^^^^ | = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! - = note: for more information, see issue #82523 <https://github.com/rust-lang/rust/issues/82523> - = note: this error originates in the derive macro `Hash` (in Nightly builds, run with -Z macro-backtrace for more info) + = note: for more information, see issue #107457 <https://github.com/rust-lang/rust/issues/107457> + = help: consider implementing the trait by hand, or remove the `packed` attribute + = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) -error: `Debug` can't be derived on this `#[repr(packed)]` struct that does not derive `Copy` - --> $DIR/deriving-with-repr-packed.rs:39:10 +error[E0507]: cannot move out of `self` which is behind a shared reference + --> $DIR/deriving-with-repr-packed.rs:22:10 | LL | #[derive(Debug, Default)] - | ^^^^^ + | ----- in this derive macro expansion +LL | #[repr(packed)] +LL | struct X(Y); + | ^ move occurs because `self.0` has type `Y`, which does not implement the `Copy` trait | - = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! - = note: for more information, see issue #82523 <https://github.com/rust-lang/rust/issues/82523> = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) -error: aborting due to 4 previous errors +error: aborting due to previous error; 2 warnings emitted +For more information about this error, try `rustc --explain E0507`. Future incompatibility report: Future breakage diagnostic: -error: `Clone` can't be derived on this `#[repr(packed)]` struct with type or const parameters - --> $DIR/deriving-with-repr-packed.rs:11:16 - | -LL | #[derive(Copy, Clone, Default, PartialEq, Eq)] - | ^^^^^ - | - = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! - = note: for more information, see issue #82523 <https://github.com/rust-lang/rust/issues/82523> -note: the lint level is defined here - --> $DIR/deriving-with-repr-packed.rs:1:9 - | -LL | #![deny(unaligned_references)] - | ^^^^^^^^^^^^^^^^^^^^ - = note: this error originates in the derive macro `Clone` (in Nightly builds, run with -Z macro-backtrace for more info) - -Future breakage diagnostic: -error: `PartialEq` can't be derived on this `#[repr(packed)]` struct with type or const parameters - --> $DIR/deriving-with-repr-packed.rs:11:32 +warning: byte slice in a packed struct that derives a built-in trait + --> $DIR/deriving-with-repr-packed.rs:31:5 | -LL | #[derive(Copy, Clone, Default, PartialEq, Eq)] - | ^^^^^^^^^ +LL | #[derive(Debug)] + | ----- in this derive macro expansion +... +LL | data: [u8], + | ^^^^^^^^^^ | = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! - = note: for more information, see issue #82523 <https://github.com/rust-lang/rust/issues/82523> -note: the lint level is defined here - --> $DIR/deriving-with-repr-packed.rs:1:9 - | -LL | #![deny(unaligned_references)] - | ^^^^^^^^^^^^^^^^^^^^ - = note: this error originates in the derive macro `PartialEq` (in Nightly builds, run with -Z macro-backtrace for more info) + = note: for more information, see issue #107457 <https://github.com/rust-lang/rust/issues/107457> + = help: consider implementing the trait by hand, or remove the `packed` attribute + = note: `#[warn(byte_slice_in_packed_struct_with_derive)]` on by default + = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) Future breakage diagnostic: -error: `Hash` can't be derived on this `#[repr(packed)]` struct that does not derive `Copy` - --> $DIR/deriving-with-repr-packed.rs:19:19 +warning: string slice in a packed struct that derives a built-in trait + --> $DIR/deriving-with-repr-packed.rs:41:5 | -LL | #[derive(Default, Hash)] - | ^^^^ +LL | #[derive(Debug)] + | ----- in this derive macro expansion +... +LL | data: str, + | ^^^^^^^^^ | = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! - = note: for more information, see issue #82523 <https://github.com/rust-lang/rust/issues/82523> -note: the lint level is defined here - --> $DIR/deriving-with-repr-packed.rs:1:9 - | -LL | #![deny(unaligned_references)] - | ^^^^^^^^^^^^^^^^^^^^ - = note: this error originates in the derive macro `Hash` (in Nightly builds, run with -Z macro-backtrace for more info) - -Future breakage diagnostic: -error: `Debug` can't be derived on this `#[repr(packed)]` struct that does not derive `Copy` - --> $DIR/deriving-with-repr-packed.rs:39:10 - | -LL | #[derive(Debug, Default)] - | ^^^^^ - | - = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release! - = note: for more information, see issue #82523 <https://github.com/rust-lang/rust/issues/82523> -note: the lint level is defined here - --> $DIR/deriving-with-repr-packed.rs:1:9 - | -LL | #![deny(unaligned_references)] - | ^^^^^^^^^^^^^^^^^^^^ - = note: this error originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) + = note: for more information, see issue #107457 <https://github.com/rust-lang/rust/issues/107457> + = help: consider implementing the trait by hand, or remove the `packed` attribute + = note: `#[warn(byte_slice_in_packed_struct_with_derive)]` on by default + = note: this warning originates in the derive macro `Debug` (in Nightly builds, run with -Z macro-backtrace for more info) |