Add `Box<[T; N]>: TryFrom<Vec<T>>`
We have `[T; N]: TryFrom<Vec<T>>` (#76310) and `Box<[T; N]>: TryFrom<Box<[T]>>`, but not this combination.
`vec.into_boxed_slice().try_into()` isn't quite a replacement for this, as that'll reallocate unnecessarily in the error case.
**Insta-stable, so needs an FCP**
(I tried to make this work with `, A`, but that's disallowed because of `#[fundamental]` https://github.com/rust-lang/rust/issues/29635#issuecomment-1247598385)
The final return value doesn't need to be tried at all -- we can just
return the checked option directly. The optimizer can probably figure
this out anyway, but there's no need to make it work here.
Rollup of 4 pull requests
Successful merges:
- #102454 (Suggest parentheses for possible range method calling)
- #102466 (only allow `ConstEquate` with `feature(gce)`)
- #102945 (Do not register placeholder `RegionOutlives` obligations when `considering_regions` is false)
- #103091 (rustdoc: remove unused HTML class `sidebar-title`)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Do not register placeholder `RegionOutlives` obligations when `considering_regions` is false
**NOTE:** I'm kinda just putting this up for discussion. I'm not certain this is correct...?
This was introduced in [`608625d`](608625dae9 (diff-6e54b18681342ec725d75591dbf384ad08cd73df29db00485fe51b4e90f76ff7R361)).
Interestingly, we only check `data.has_placeholders()` for `RegionOutlives`, and not for `TypeOutlives`... why? For the record, that different treatment between `RegionOutlives` and `TypeOutlives` is why the fix "The compiling succeeds when all `'a : 'b` are replaced with `&'a () : 'b`" in #100689 _"works"_, but it seems like an implementation detail considering this.
Also, why do we care about placeholder regions being registered if `considering_regions` is false? It doesn't seem to affect any UI tests, for example.
r? `@lcnr`
Fixes#102899Fixes#100689
remote-test-server: Show command line arguments
The user of remote-test-server should get at least some minimal command line help as this is often started manually.
r? `@pietroalbini`
* Since it's used exclusively on source pages, no need to explicitly
select.
* No need to hide it when the sidebar is open, since it fills the whole
page.
Rollup of 5 pull requests
Successful merges:
- #103087 (Documentation BTreeMap::append's behavior for already existing keys)
- #103089 (Mark derived StructuralEq as automatically derived.)
- #103102 (Clarify the possible return values of `len_utf16`)
- #103109 (PhantomData: inline a macro that is used only once)
- #103120 (rustdoc: Do not expect `doc(primitive)` modules to always exist)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Clarify the possible return values of `len_utf16`
`char::len_utf16` always return 1 or 2. Clarify this in the docs, in the same way as `char::len_utf8`.
Documentation BTreeMap::append's behavior for already existing keys
`BTreeMap::append` overwrites existing values with new ones. This commit adds explicit documentation for that.
