Add proc_macro to the extern prelude. #7700
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(rust_highfive has picked a reviewer for you, use r? to override) |
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r=me, but I think this may need to be gated? |
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Oops. I assume you mean in the test? |
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Oh! I believe beta/stable are failing because I also see that this is a new language feature, but I believe this has already been signed off by all the requisite teams, so we should be good to go when CI is ready |
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Sorry, I was being dumb. I added a dynamic test in the same fashion as the old pipeline test. Does that seem reasonable? |
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@bors: r+ |
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📌 Commit 4d64eb9 has been approved by |
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Add proc_macro to the extern prelude. This makes it so that a proc-macro library can use the `proc_macro` crate without the `extern crate proc_macro;` item on the 2018 edition. This is the Cargo half of rust-lang/rust#64882.
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☀️ Test successful - checks-azure |
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Version 1.42.0 (2020-03-12)
==========================
Language
--------
- [You can now use the slice pattern syntax with subslices.][67712] e.g.
```rust
fn foo(words: &[&str]) {
match words {
["Hello", "World", "!", ..] => println!("Hello World!"),
["Foo", "Bar", ..] => println!("Baz"),
rest => println!("{:?}", rest),
}
}
```
- [You can now use `#[repr(transparent)]` on univariant `enum`s.][68122] Meaning
that you can create an enum that has the exact layout and ABI of the type
it contains.
- [There are some *syntax-only* changes:][67131]
- `default` is syntactically allowed before items in `trait` definitions.
- Items in `impl`s (i.e. `const`s, `type`s, and `fn`s) may syntactically
leave out their bodies in favor of `;`.
- Bounds on associated types in `impl`s are now syntactically allowed
(e.g. `type Foo: Ord;`).
- `...` (the C-variadic type) may occur syntactically directly as the type of
any function parameter.
These are still rejected *semantically*, so you will likely receive an error
but these changes can be seen and parsed by procedural macros and
conditional compilation.
Compiler
--------
- [Added tier 2* support for `armv7a-none-eabi`.][68253]
- [Added tier 2 support for `riscv64gc-unknown-linux-gnu`.][68339]
- [`Option::{expect,unwrap}` and
`Result::{expect, expect_err, unwrap, unwrap_err}` now produce panic messages
pointing to the location where they were called, rather than
`core`'s internals. ][67887]
* Refer to Rust's [platform support page][forge-platform-support] for more
information on Rust's tiered platform support.
Libraries
---------
- [`iter::Empty<T>` now implements `Send` and `Sync` for any `T`.][68348]
- [`Pin::{map_unchecked, map_unchecked_mut}` no longer require the return type
to implement `Sized`.][67935]
- [`io::Cursor` now derives `PartialEq` and `Eq`.][67233]
- [`Layout::new` is now `const`.][66254]
- [Added Standard Library support for `riscv64gc-unknown-linux-gnu`.][66899]
Stabilized APIs
---------------
- [`CondVar::wait_while`]
- [`CondVar::wait_timeout_while`]
- [`DebugMap::key`]
- [`DebugMap::value`]
- [`ManuallyDrop::take`]
- [`matches!`]
- [`ptr::slice_from_raw_parts_mut`]
- [`ptr::slice_from_raw_parts`]
Cargo
-----
- [You no longer need to include `extern crate proc_macro;` to be able to
`use proc_macro;` in the `2018` edition.][cargo/7700]
Compatibility Notes
-------------------
- [`Error::description` has been deprecated, and its use will now produce a
warning.][66919] It's recommended to use `Display`/`to_string` instead.
- [`use $crate;` inside macros is now a hard error.][37390] The compiler
emitted forward compatibility warnings since Rust 1.14.0.
- [As previously announced, this release reduces the level of support for
32-bit Apple targets to tier 3.][apple-32bit-drop]. This means that the
source code is still available to build, but the targets are no longer tested
and no release binary is distributed by the Rust project. Please refer to the
linked blog post for more information.
[37390]: rust-lang/rust#37390
[68253]: rust-lang/rust#68253
[68348]: rust-lang/rust#68348
[67935]: rust-lang/rust#67935
[68339]: rust-lang/rust#68339
[68122]: rust-lang/rust#68122
[67712]: rust-lang/rust#67712
[67887]: rust-lang/rust#67887
[67131]: rust-lang/rust#67131
[67233]: rust-lang/rust#67233
[66899]: rust-lang/rust#66899
[66919]: rust-lang/rust#66919
[66254]: rust-lang/rust#66254
[cargo/7700]: rust-lang/cargo#7700
[`DebugMap::key`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.key
[`DebugMap::value`]: https://doc.rust-lang.org/stable/std/fmt/struct.DebugMap.html#method.value
[`ManuallyDrop::take`]: https://doc.rust-lang.org/stable/std/mem/struct.ManuallyDrop.html#method.take
[`matches!`]: https://doc.rust-lang.org/stable/std/macro.matches.html
[`ptr::slice_from_raw_parts_mut`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts_mut.html
[`ptr::slice_from_raw_parts`]: https://doc.rust-lang.org/stable/std/ptr/fn.slice_from_raw_parts.html
[`CondVar::wait_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_while
[`CondVar::wait_timeout_while`]: https://doc.rust-lang.org/stable/std/sync/struct.Condvar.html#method.wait_timeout_while
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Summary: Rebase of D21840371 with `throws InterruptedException` added to unbreak RustBinaryIntegrationTest.java. --- This diff updates Buck's behavior to match the behavior of Cargo 1.42+ ([rust-lang/cargo#7700](rust-lang/cargo#7700)) to no longer require procedural macro crates to specify "extern crate proc_macro". See the release announcement of this change in https://blog.rust-lang.org/2020/03/12/Rust-1.42.html#use-proc_macrotokenstream-now-works. Buck technically has no lower compiler version bound on its rustc support, so if someone requires support for rustc <1.42 in Buck then we can consider introducing a buckconfig to opt out of --extern=proc_macro. Reviewed By: jsgf fbshipit-source-id: 74fac22e9a67e6967151ab7e38f7e97be7300a4d
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This makes it so that a proc-macro library can use the
proc_macrocrate without theextern crate proc_macro;item on the 2018 edition. This is the Cargo half of rust-lang/rust#64882.