Add all unstable features to Unstable Book.
Add all unstable features to the Unstable Book, also remove a few that
either no longer exist or were promoted to stable.
These changes were extracted out of
https://github.com/rust-lang/rust/pull/40694
Added core::cmp::Reverse for sort_by_key reverse sorting
I'm not sure if this is the best way to go about proposing this feature but it's pretty useful. It allows you to use `sort_by_key` and return tuples where a single item is then reversed to how it normally sorts.
I quite miss something like this in Rust currently though I'm not sure if this is the best way to implement it.
Add all unstable features to the Unstable Book, also remove a few that
either no longer exist or were promoted to stable.
These changes were extracted out of
https://github.com/rust-lang/rust/pull/40694
Update various book modules
This includes an important fix for rustc contributors in
https://github.com/rust-lang/book/pull/571
I'm going to update the other ones as well here while we're at it; no
need to spam PRs.
r? @nrc
Improve std::net docs
Fixes#29363
Summary:
* Added a _lot_ of missing links, both to other types/methods and to IETF RFCs, and changed occurences of just "RFC" to "IETF RFC"
* Expanded a bunch of top-level docs, specifically the module docs & the docs for `TcpListener`, `TcpStream`, `UdpSocket`, `IpAddr`, `Ipv4Addr`, `Ipv6Addr`, `SocketAddr`, `SocketAddrV4`, `SocketAddrV6`,
* Expanded method docs for `SocketAddrV6`, `AddrParseError`,
* Various edits for clarity, consistency, and accuracy
See the commit descriptions for more detail.
Things not done quite as laid out in the task list in #29363:
* `AddrParseError` still doesn't have examples, but I wasn't quite sure how to do them; other `FromStr` error types don't have any, either
* I didn't link to an IETF RFC in `IpAddr`, but in `Ipv4Addr` and `Ipv6Addr` and linked tho those from `IpAddr`; this seems more appropriate to me
* Similarly, I didn't really exand `SocketAddr`'s docs, but elaborated on `SocketAddrV4` and `SocketAddrV6`'s and linked to them from `SocketAddr`
Theres definitely still room for improvement, but this should be a good first effort 😄
Document Cursor::new position is 0
... even if contained `Vec` is not empty. E. g. for
```
let v = vec![10u8, 20];
let mut c = io::Cursor::new(v);
c.write_all(b"aaaa").unwrap();
println!("{:?}", c.into_inner());
```
result is
```
[97, 97, 97, 97]
```
and not
```
[10, 20, 97, 97, 97, 97]
```
Specialize Vec::from_iter for vec::IntoIter
It's fairly common to expose an API which takes an `IntoIterator` and
immediately collects that into a vector. It's also common to buffer
a bunch of items into a vector and then pass that into one of these
APIs. If the iterator hasn't been advanced, we can make this `from_iter`
simply reassemble the original `Vec` with no actual iteration or
reallocation.
r? @aturon
Update docs for std::str
fixes#29375
I noticed there are docs for the `str` primitive type, which contained extensive examples, so my additions give a more general explanation of `&str`. But please let me know if something can be explained more or changed.
r? @steveklabnik
store a copy of the Issue32230 info within TypeError
The data can't be looked up from the region variable directly, because
the region variable might have been destroyed at the end of a snapshot.
Fixes#40000.
Fixes#40743.
beta-nominating because regression.
r? @nikomatsakis
appveyor: Downgrade MinGW to 6.2.0
It looks like the 6.3.0 MinGW comes with a gdb which has issues (#40184) that an
attempted workaround (#40777) does not actually fix (#40835). The original
motivation for upgradin MinGW was to fix build flakiness (#40546) due to newer
builds not exhibiting the same bug, so let's hope that 6.2.0 isn't too far back
in time and still contains the fix we need.
Closes#40835
