Update lang/rust to version 1.49.0.
Pkgsrc changes:
* Adjust patches, convert tabs to spaces so that tests pass.
* Remove patches which are no longer needed (upstream changed)
* Minor adjustments for SunOS, e.g. disable stack probes.
* Adjust cargo checksum patching accordingly.
* Remove commented-out use of PATCHELF on NetBSD, which doesn't work anyway...
Upstream changes:
Version 1.49.0 (2020-12-31)
============================
Language
-----------------------
- [Unions can now implement `Drop`, and you can now have a field in a union
with `ManuallyDrop<T>`.][77547]
- [You can now cast uninhabited enums to integers.][76199]
- [You can now bind by reference and by move in patterns.][76119] This
allows you to selectively borrow individual components of a type. E.g.
```rust
#[derive(Debug)]
struct Person {
name: String,
age: u8,
}
let person = Person {
name: String::from("Alice"),
age: 20,
};
// `name` is moved out of person, but `age` is referenced.
let Person { name, ref age } = person;
println!("{} {}", name, age);
```
Compiler
-----------------------
- [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228]
- [Added tier 2 support for `aarch64-apple-darwin`.][75991]
- [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914]
- [Added tier 3 support for `mipsel-unknown-none`.][78676]
- [Raised the minimum supported LLVM version to LLVM 9.][78848]
- [Output from threads spawned in tests is now captured.][78227]
- [Change os and vendor values to "none" and "unknown" for some targets][78951]
\* Refer to Rust's [platform support page][forge-platform-support] for more
information on Rust's tiered platform support.
Libraries
-----------------------
- [`RangeInclusive` now checks for exhaustion when calling `contains`
and indexing.][78109]
- [`ToString::to_string` now no longer shrinks the internal buffer
in the default implementation.][77997]
- [`ops::{Index, IndexMut}` are now implemented for fixed sized
arrays of any length.][74989]
Stabilized APIs
---------------
- [`slice::select_nth_unstable`]
- [`slice::select_nth_unstable_by`]
- [`slice::select_nth_unstable_by_key`]
The following previously stable methods are now `const`.
- [`Poll::is_ready`]
- [`Poll::is_pending`]
Cargo
-----------------------
- [Building a crate with `cargo-package` should now be independently
reproducible.][cargo/8864]
- [`cargo-tree` now marks proc-macro crates.][cargo/8765]
- [Added `CARGO_PRIMARY_PACKAGE` build-time environment
variable.] [cargo/8758] This variable will be set if the crate
being built is one the user selected to build, either with `-p`
or through defaults.
- [You can now use glob patterns when specifying packages &
targets.][cargo/8752]
Compatibility Notes
-------------------
- [Demoted `i686-unknown-freebsd` from host tier 2 to target tier
2 support.][78746]
- [Macros that end with a semi-colon are now treated as statements
even if they expand to nothing.][78376]
- [Rustc will now check for the validity of some built-in attributes
on enum variants.][77015] Previously such invalid or unused
attributes could be ignored.
- Leading whitespace is stripped more uniformly in documentation
comments, which may change behavior. You read [this post about
the changes][rustdoc-ws-post] for more details.
- [Trait bounds are no longer inferred for associated types.][79904]
Internal Only
-------------
These changes provide no direct user facing benefits, but represent
significant improvements to the internals and overall performance
of rustc and related tools.
- [rustc's internal crates are now compiled using the `initial-exec` Thread
Local Storage model.][78201]
- [Calculate visibilities once in resolve.][78077]
- [Added `system` to the `llvm-libunwind` bootstrap config option.][77703]
- [Added `--color` for configuring terminal color support to bootstrap.][79004]
[75991]: https://github.com/rust-lang/rust/pull/75991
[78951]: https://github.com/rust-lang/rust/pull/78951
[78848]: https://github.com/rust-lang/rust/pull/78848
[78746]: https://github.com/rust-lang/rust/pull/78746
[78376]: https://github.com/rust-lang/rust/pull/78376
[78228]: https://github.com/rust-lang/rust/pull/78228
[78227]: https://github.com/rust-lang/rust/pull/78227
[78201]: https://github.com/rust-lang/rust/pull/78201
[78109]: https://github.com/rust-lang/rust/pull/78109
[78077]: https://github.com/rust-lang/rust/pull/78077
[77997]: https://github.com/rust-lang/rust/pull/77997
[77703]: https://github.com/rust-lang/rust/pull/77703
[77547]: https://github.com/rust-lang/rust/pull/77547
[77015]: https://github.com/rust-lang/rust/pull/77015
[76199]: https://github.com/rust-lang/rust/pull/76199
[76119]: https://github.com/rust-lang/rust/pull/76119
[75914]: https://github.com/rust-lang/rust/pull/75914
[74989]: https://github.com/rust-lang/rust/pull/74989
[79004]: https://github.com/rust-lang/rust/pull/79004
[78676]: https://github.com/rust-lang/rust/pull/78676
[79904]: https://github.com/rust-lang/rust/issues/79904
[cargo/8864]: https://github.com/rust-lang/cargo/pull/8864
[cargo/8765]: https://github.com/rust-lang/cargo/pull/8765
[cargo/8758]: https://github.com/rust-lang/cargo/pull/8758
[cargo/8752]: https://github.com/rust-lang/cargo/pull/8752
[`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable
[`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by
[`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key
[`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html
[`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready
[`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending
[rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc
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