librustc_errors: Move annotation collection to own impl
Extracted from work on #59346. This moves the annotation collection to
the `FileWithAnnotatedLines` impl to allow easier re-use in a separate
EmitterWriter. Even without that new EmitterWriter present, I think it makes
sense to have this as an associated function.
Weak::into_raw
Hello
This is my first shot at #60728. I'd like to consult it a bit before moving further.
The biggest question I have is if this API makes sense. My motivation for it is to be able to store the `Weak` in `AtomicPtr`. For that I don't actually need for the pointer to point to the `T`, any pointer (maybe casted to `usize`) would be good enough, but this mirrors what `Arc` does and could be useful for other things too (like comparing if Arc and Weak point to the same thing without playing with the counts), while some opaque pointer wouldn't.
Some secondary questions, if this is deemed desirable are:
* The weak pointer may be dangling if it is created by `Weak::new()`. It would make sense to treat this as NULL, but that is incompatible with `T: ?Sized` ‒ both `new()` and `ptr::null()` are available only for sized types. The current implementation is therefore also available only for sized `T`s. It would be possible to allow `?Sized` if the API would be `fn into_raw(self) -> Option<NonNull<T>>` and `fn from_raw(NonNull<T>)`, but that's different API than `Arc` has. What would be preferred?
* There's a FIXME in my code about what I suspect could be UB. Is it really UB & how to get the pointer correctly? Is manual offsetting of the pointer the only way?
* Am I missing some other necessary thing around the feature gates and such?
* Is the documentation understandable? I know writing docs is not my strongest skill :-|.
Thinks I'd like to do as part of the PR, but are not yet done:
* Turn the referenced issue into tracking issue for the feature flag.
* Once the `sync::Weak` is considered reasonable, I'd do the equivalent for `rc::Weak`.
* This might call for few more tests than what is currently part of the documentation.
Implement nth_back for RChunks(Exact)(Mut)
Part of #54054.
These implementations may not be optimal because of the use of `self.len()`, but it's quite cheap and simplifies the code a lot.
There's quite some duplication going on here, I wouldn't mind cleaning this up later. A good next step would probably be to add private `split_off_up_to`/`split_off_from` helper methods for slices since their behavior is commonly useful throughout the `Chunks` types.
r? @scottmcm
Add Step::sub_usize
Required for #54054.
I'm aware that the `Step` trait needs a rework, but this still seems like a reasonable addition?
This currently doesn't compile because Chalk contains a type that implement this trait, and this is a breaking change. How can that be fixed?
Implement `iter::Sum` and `iter::Product` for `Option`
This is similar to the existing implementation for `Result`. It will take each item into the accumulator unless a `None` is returned.
I based a lot of this on #38580. From that discussion it didn't seem like this addition would be too controversial or difficult. One thing I still don't understand is picking the values for the `stable` attribute. This is my first non-documentation PR for rust so I am open to any feedback on improvements.
Rollup of 9 pull requests
Successful merges:
- #60742 (Allow const parameters in array sizes to be unified)
- #60756 (Add better tests for hidden lifetimes in impl trait)
- #60928 (Changes the type `mir::Mir` into `mir::Body`)
- #61024 (tests: Centralize proc macros commonly used for testing)
- #61157 (BufReader: In Seek impl, remove extra discard_buffer call)
- #61195 (Special-case `.llvm` in mangler)
- #61202 (Print PermissionExt::mode() in octal in Documentation Examples)
- #61259 (Mailmap fixes)
- #61273 (mention that MaybeUninit is a bit like Option)
Failed merges:
r? @ghost
Print PermissionExt::mode() in octal in Documentation Examples
Printing the file permission mode on unix systems in decimal feels unintuitive. Printing it in octal gives the expected form of e.g. `664`.
tests: Centralize proc macros commonly used for testing
Many proc macros in `ui\proc-macro\auxiliary` were doing same things.
(I added a fair share of those myself.)
Now commonly used macros (empty, identity, etc) are collected in one place - `ui\proc-macro\auxiliary\test-macros.rs`.
Changes the type `mir::Mir` into `mir::Body`
Fixes part 1 of #60229 (previously attempted in #60242).
I stumbled upon the issue and it seems that the previous attempt at solving it was not merged. This is a second try more up-to-date.
The commit should have changed comments as well.
At the time of writting, it passes the tidy and check tool.
