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rust/tests/ui/feature-gates/feature-gate-rustc-attrs-1.stderr

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Tweak unstable diagnostic output
2019-04-10 23:40:12 +00:00
error[E0658]: the `#[rustc_variance]` attribute is just used for rustc unit tests and will never be stable
Remove redundant `ignore-tidy-linelength` annotations This is step 2 towards fixing #77548. In the codegen and codegen-units test suites, the `//` comment markers were kept in order not to affect any source locations. This is because these tests cannot be automatically `--bless`ed.
2021-04-03 11:05:11 +00:00
--> $DIR/feature-gate-rustc-attrs-1.rs:3:1
Feature gate arbitrary tokens in non-macro attributes with a separate gate Feature gate `rustc_` and `derive_` with their own gates again instead of `custom_attribute`
2018-08-11 13:40:08 +00:00
|
Update tests
2019-03-09 12:03:44 +00:00
LL | #[rustc_variance]
Feature gate arbitrary tokens in non-macro attributes with a separate gate Feature gate `rustc_` and `derive_` with their own gates again instead of `custom_attribute`
2018-08-11 13:40:08 +00:00
| ^^^^^^^^^^^^^^^^^
|
normalize use of backticks in compiler messages for libsyntax/feature_gate https://github.com/rust-lang/rust/issues/60532
2019-07-09 09:32:08 +00:00
= help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
Feature gate arbitrary tokens in non-macro attributes with a separate gate Feature gate `rustc_` and `derive_` with their own gates again instead of `custom_attribute`
2018-08-11 13:40:08 +00:00
Tweak unstable diagnostic output
2019-04-10 23:40:12 +00:00
error[E0658]: the `#[rustc_error]` attribute is just used for rustc unit tests and will never be stable
Remove redundant `ignore-tidy-linelength` annotations This is step 2 towards fixing #77548. In the codegen and codegen-units test suites, the `//` comment markers were kept in order not to affect any source locations. This is because these tests cannot be automatically `--bless`ed.
2021-04-03 11:05:11 +00:00
--> $DIR/feature-gate-rustc-attrs-1.rs:4:1
Feature gate arbitrary tokens in non-macro attributes with a separate gate Feature gate `rustc_` and `derive_` with their own gates again instead of `custom_attribute`
2018-08-11 13:40:08 +00:00
|
Update tests
2019-03-09 12:03:44 +00:00
LL | #[rustc_error]
Feature gate arbitrary tokens in non-macro attributes with a separate gate Feature gate `rustc_` and `derive_` with their own gates again instead of `custom_attribute`
2018-08-11 13:40:08 +00:00
| ^^^^^^^^^^^^^^
|
normalize use of backticks in compiler messages for libsyntax/feature_gate https://github.com/rust-lang/rust/issues/60532
2019-07-09 09:32:08 +00:00
= help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
Feature gate arbitrary tokens in non-macro attributes with a separate gate Feature gate `rustc_` and `derive_` with their own gates again instead of `custom_attribute`
2018-08-11 13:40:08 +00:00
Generalize `get_nullable_type` to allow types where null is all-ones. Generalize get_nullable_type to accept types that have an all-ones bit pattern as their sentry "null" value. This will allow [`OwnedFd`], [`BorrowedFd`], [`OwnedSocket`], and [`BorrowedSocket`] to be marked with `#[rustc_nonnull_optimization_guaranteed]`, which will allow `Option<OwnedFd>`, `Option<BorrowedFd>`, `Option<OwnedSocket>`, and `Option<BorrowedSocket>` to be used in FFI declarations, as described in the [I/O safety RFC]. For example, it will allow a function like `open` on Unix and `WSASocketW` on Windows to be declared using `Option<OwnedFd>` and `Option<OwnedSocket>` return types, respectively. The actual change to add `#[rustc_nonnull_optimization_guaranteed]` to the abovementioned types will be a separate PR, as it'll depend on having this patch in the stage0 compiler. Also, update the diagnostics to mention that "niche optimizations" are used in libstd as well as libcore, as `rustc_layout_scalar_valid_range_start` and `rustc_layout_scalar_valid_range_end` are already in use in libstd. [`OwnedFd`]: https://github.com/rust-lang/rust/blob/c9dc44be24c58ff13ce46416c4b97ab5c1bd8429/library/std/src/os/fd/owned.rs#L49 [`BorrowedFd`]: https://github.com/rust-lang/rust/blob/c9dc44be24c58ff13ce46416c4b97ab5c1bd8429/library/std/src/os/fd/owned.rs#L29 [`OwnedSocket`]: https://github.com/rust-lang/rust/blob/c9dc44be24c58ff13ce46416c4b97ab5c1bd8429/library/std/src/os/windows/io/socket.rs#L51 [`BorrowedSocket`]: https://github.com/rust-lang/rust/blob/c9dc44be24c58ff13ce46416c4b97ab5c1bd8429/library/std/src/os/windows/io/socket.rs#L29 [I/O safety RFC]: https://github.com/rust-lang/rfcs/blob/master/text/3128-io-safety.md#ownedfd-and-borrowedfdfd-1
2022-03-03 22:41:10 +00:00
error[E0658]: the `#[rustc_nonnull_optimization_guaranteed]` attribute is just used to enable niche optimizations in libcore and libstd and will never be stable
Remove redundant `ignore-tidy-linelength` annotations This is step 2 towards fixing #77548. In the codegen and codegen-units test suites, the `//` comment markers were kept in order not to affect any source locations. This is because these tests cannot be automatically `--bless`ed.
2021-04-03 11:05:11 +00:00
--> $DIR/feature-gate-rustc-attrs-1.rs:5:1
Allow null-pointer-optimized enums in FFI if their underlying representation is FFI safe This allows types like Option<NonZeroU8> to be used in FFI without triggering the improper_ctypes lint. This works by changing the is_repr_nullable_ptr function to consider an enum E to be FFI-safe if: - E has no explicit #[repr(...)]. - It only has two variants. - One of those variants is empty (meaning it has no fields). - The other variant has only one field. - That field is one of the following: - &T - &mut T - extern "C" fn - core::num::NonZero* - core::ptr::NonNull<T> - #[repr(transparent)] struct wrapper around one of the types in this list. - The size of E and its field are both known and are both the same size (implying E is participating in the nonnull optimization).
2019-05-22 13:49:43 +00:00
|
LL | #[rustc_nonnull_optimization_guaranteed]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
normalize use of backticks in compiler messages for libsyntax/feature_gate https://github.com/rust-lang/rust/issues/60532
2019-07-09 09:32:08 +00:00
= help: add `#![feature(rustc_attrs)]` to the crate attributes to enable
Allow null-pointer-optimized enums in FFI if their underlying representation is FFI safe This allows types like Option<NonZeroU8> to be used in FFI without triggering the improper_ctypes lint. This works by changing the is_repr_nullable_ptr function to consider an enum E to be FFI-safe if: - E has no explicit #[repr(...)]. - It only has two variants. - One of those variants is empty (meaning it has no fields). - The other variant has only one field. - That field is one of the following: - &T - &mut T - extern "C" fn - core::num::NonZero* - core::ptr::NonNull<T> - #[repr(transparent)] struct wrapper around one of the types in this list. - The size of E and its field are both known and are both the same size (implying E is participating in the nonnull optimization).
2019-05-22 13:49:43 +00:00
error: aborting due to 3 previous errors
Feature gate arbitrary tokens in non-macro attributes with a separate gate Feature gate `rustc_` and `derive_` with their own gates again instead of `custom_attribute`
2018-08-11 13:40:08 +00:00
Fix tests
2019-01-28 21:28:44 +00:00
For more information about this error, try `rustc --explain E0658`.
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