Add lint `equatable_if_let`
This is my attempt for #1716. There is a major false positive, which is people may implement `PartialEq` in a different way. It is unactionable at the moment so I put it into `nursery`.
There is a trait `StructuralPartialEq` for solving this problem which is promising but it has several problems currently:
* Integers and tuples doesn't implement it.
* Some types wrongly implement it, like `Option<T>` when `T` doesn't implement it.
I consider them bugs and against the propose of `StructuralPartialEq`. When they become fixed, this lint can become a useful lint with a single line change.
changelog: New lint: [`equatable_if_let`]
When `cargo report future-incompatibilities` is stabilized
(see #71249), this will cause dependencies that trigger
this lint to be included in the report.
Add truncate note to Vec::resize
A very minor addition to the `Vec::resize` documentation to point out the `truncate` method.
When I was searching for something matching `truncate` I managed to miss it, along with some colleagues. We later found it by chance. We did find `resize` however, so I was hoping to point it out in the documentation.
Remove some feature gates
The first commit removes various feature gates that are unused. The second commit replaces some `Fn` implementations with `Iterator` implementations, which is much cleaner IMO. The third commit replaces an unboxed_closures feature gate with min_specialization. For some reason the unboxed_closures feature gate suppresses the min_specialization feature gate from triggering on an `TrustedStep` impl. The last comment just turns a regular comment into a doc comment as drive by cleanup. I can move it to a separate PR if preferred.
Partially stabilize `array_methods`
This stabilizes `<[T; N]>::as_slice` and `<[T; N]>::as_mut_slice`, which is forms part of the `array_methods` feature: #76118.
This also makes `<[T; N]>::as_slice` const due to its trivial nature.
Manual Debug for Unix ExitCode ExitStatus ExitStatusError
These structs have misleading names. An ExitStatus[Error] is actually a Unix wait status; an ExitCode is actually an exit status. These misleading names appear in the `Debug` output.
The `Display` impls on Unix have been improved, but the `Debug` impls are still misleading, as reported in #74832.
Fix this by pretending that these internal structs are called `unix_exit_status` and `unix_wait_status` as applicable. (We can't actually rename the structs because of the way that the cross-platform machinery works: the names are cross-platform.)
After this change, this program
```
#![feature(exit_status_error)]
fn main(){
let x = std::process::Command::new("false").status().unwrap();
dbg!(x.exit_ok());
eprintln!("x={:?}",x);
}
```
produces this output
```
[src/main.rs:4] x.exit_ok() = Err(
ExitStatusError(
unix_wait_status(
256,
),
),
)
x=ExitStatus(unix_wait_status(256))
```
Closes#74832
Remove unnecessary unsafe block in `process_unix`
Because it's nested under this unsafe fn!
This block isn't detected as unnecessary because of a bug in the compiler: #88260.
Mark unsafe methods NonZero*::unchecked_(add|mul) as const.
Now that https://github.com/rust-lang/rfcs/pull/3016 has landed, these two unstable `std` function can be marked `const`, according to this detail of #84186.
const fn for option copied, take & replace
Tracking issue: [#67441](https://github.com/rust-lang/rust/issues/67441)
Adding const fn for the copied, take and replace method of Option. Also adding necessary unit test.
It's my first contribution so I am pretty sure I don't know what I'm doing but there's a first for everything!
Add `Ipv6Addr::is_benchmarking`
This PR adds the unstable method `Ipv6Addr::is_benchmarking`. This method is added for parity with `Ipv4Addr::is_benchmarking`, and I intend to use it in a future rework of `Ipv6Addr::is_global` (edit: #86634) to more accurately follow the [IANA Special Address Registry](https://www.iana.org/assignments/iana-ipv6-special-registry/iana-ipv6-special-registry.xhtml) (like is done in `Ipv4Addr::is_global`).
With `Ipv6Addr::is_benchmarking` and `Ipv4Addr::is_benchmarking` now both existing, `IpAddr::is_benchmarking` is also added.
Fix read_to_end to not grow an exact size buffer
If you know how much data to expect and use `Vec::with_capacity` to pre-allocate a buffer of that capacity, `Read::read_to_end` will still double its capacity. It needs some space to perform a read, even though that read ends up returning `0`.
It's a bummer to carefully pre-allocate 1GB to read a 1GB file into memory and end up using 2GB.
This fixes that behavior by special casing a full buffer and reading into a small "probe" buffer instead. If that read returns `0` then it's confirmed that the buffer was the perfect size. If it doesn't, the probe buffer is appended to the normal buffer and the read loop continues.
Fixing this allows several workarounds in the standard library to be removed:
- `Take` no longer needs to override `Read::read_to_end`.
- The `reservation_size` callback that allowed `Take` to inhibit the previous over-allocation behavior isn't needed.
- `fs::read` doesn't need to reserve an extra byte in `initial_buffer_size`.
Curiously, there was a unit test that specifically checked that `Read::read_to_end` *does* over-allocate. I removed that test, too.
Fixes#73159
This is similar to #69350 - if the user didn't initially
write out a 'static lifetime, adding 'static in response to
a lifetime error is usually the wrong thing to do.
Add expansion to while desugar spans
In the same vein as #88163, this reverts a change in Clippy behavior as a result of #80357 (and reverts some `#[allow]`s): This changes `clippy::blocks_in_if_conditions` to not fire on `while` loops. Though we might actually want Clippy to lint those cases, we should introduce the change purposefully, with tests, and possibly under a different lint name.
The actual change here is to add a desugaring expansion to the spans when lowering a `while` loop.
r? `@Manishearth`
Add expansion to while desugar spans
In the same vein as #88163, this reverts a change in Clippy behavior as a result of #80357 (and reverts some `#[allow]`s): This changes `clippy::blocks_in_if_conditions` to not fire on `while` loops. Though we might actually want Clippy to lint those cases, we should introduce the change purposefully, with tests, and possibly under a different lint name.
The actual change here is to add a desugaring expansion to the spans when lowering a `while` loop.
r? `@Manishearth`
Update Let's Encrypt ROOT CA certificate in dist-(i686|x86_64)-linux docker images
The DST Root CA X3 used by Let's Encrypt has expired ([Let's Encrypt announcement](https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/)). This patch installs the new root certificate (ISRG Root X1) and disables the old one. Disabling the old one is necessary because otherwise curl still fails to download from servers with Let's Encrypt certs even though they are cross-signed.
Fixes#89484.
These two functions are essentially no-ops (and compile to just a load and
return), but show up in process_obligations profiles with a high call count --
so worthwhile to try and inline them away.
