Matthias Krüger [Thu, 20 Jan 2022 22:37:31 +0000 (23:37 +0100)]
Rollup merge of #92860 - CraftSpider:rustdoc-json-impl-ice, r=jsha
Fix errors on blanket impls by ignoring the children of generated impls
Related to #83718
We can safely skip the children, as they don't contain any new info, and may be subtly different for reasons hard to track down, in ways that are consistently worse than the actual generic impl.
Matthias Krüger [Thu, 20 Jan 2022 22:37:29 +0000 (23:37 +0100)]
Rollup merge of #91032 - eholk:generator-drop-tracking, r=nikomatsakis
Introduce drop range tracking to generator interior analysis
This PR addresses cases such as this one from #57478:
```rust
struct Foo;
impl !Send for Foo {}
let _: impl Send = || {
let guard = Foo;
drop(guard);
yield;
};
```
Previously, the `generator_interior` pass would unnecessarily include the type `Foo` in the generator because it was not aware of the behavior of `drop`. We fix this issue by introducing a drop range analysis that finds portions of the code where a value is guaranteed to be dropped. If a value is dropped at all suspend points, then it is no longer included in the generator type. Note that we are using "dropped" in a generic sense to include any case in which a value has been moved. That is, we do not only look at calls to the `drop` function.
There are several phases to the drop tracking algorithm, and we'll go into more detail below.
1. Use `ExprUseVisitor` to find values that are consumed and borrowed.
2. `DropRangeVisitor` uses consume and borrow information to gather drop and reinitialization events, as well as build a control flow graph.
3. We then propagate drop and reinitialization information through the CFG until we reach a fix point (see `DropRanges::propagate_to_fixpoint`).
4. When recording a type (see `InteriorVisitor::record`), we check the computed drop ranges to see if that value is definitely dropped at the suspend point. If so, we skip including it in the type.
## 1. Use `ExprUseVisitor` to find values that are consumed and borrowed.
We use `ExprUseVisitor` to identify the places where values are consumed. We track both the `hir_id` of the value, and the `hir_id` of the expression that consumes it. For example, in the expression `[Foo]`, the `Foo` is consumed by the array expression, so after the array expression we can consider the `Foo` temporary to be dropped.
In this process, we also collect values that are borrowed. The reason is that the MIR transform for generators conservatively assumes anything borrowed is live across a suspend point (see `rustc_mir_transform::generator::locals_live_across_suspend_points`). We match this behavior here as well.
## 2. Gather drop events, reinitialization events, and control flow graph
After finding the values of interest, we perform a post-order traversal over the HIR tree to find the points where these values are dropped or reinitialized. We use the post-order index of each event because this is how the existing generator interior analysis refers to the position of suspend points and the scopes of variables.
During this traversal, we also record branching and merging information to handle control flow constructs such as `if`, `match`, and `loop`. This is necessary because values may be dropped along some control flow paths but not others.
## 3. Iterate to fixed point
The previous pass found the interesting events and locations, but now we need to find the actual ranges where things are dropped. Upon entry, we have a list of nodes ordered by their position in the post-order traversal. Each node has a set of successors. For each node we additionally keep a bitfield with one bit per potentially consumed value. The bit is set if we the value is dropped along all paths entering this node.
To compute the drop information, we first reverse the successor edges to find each node's predecessors. Then we iterate through each node, and for each node we set its dropped value bitfield to the intersection of all incoming dropped value bitfields.
If any bitfield for any node changes, we re-run the propagation loop again.
## 4. Ignore dropped values across suspend points
At this point we have a data structure where we can ask whether a value is guaranteed to be dropped at any post order index for the HIR tree. We use this information in `InteriorVisitor` to check whether a value in question is dropped at a particular suspend point. If it is, we do not include that value's type in the generator type.
Note that we had to augment the region scope tree to include all yields in scope, rather than just the last one as we did before.
Matthias Krüger [Wed, 19 Jan 2022 18:19:51 +0000 (19:19 +0100)]
Rollup merge of #93065 - dtolnay:ringbuffer, r=lcnr
Pretty printer algorithm revamp step 2
This PR follows #92923 as a second chunk of modernizations backported from https://github.com/dtolnay/prettyplease into rustc_ast_pretty.
I've broken this up into atomic commits that hopefully are sensible in isolation. At every commit, the pretty printer is compilable and has runtime behavior that is identical to before and after the PR. None of the refactoring so far changes behavior.
The general theme of this chunk of commits is: the logic in the old pretty printer is doing some very basic things (pushing and popping tokens on a ring buffer) but expressed in a too-low-level way that I found makes it quite complicated/subtle to reason about. There are a number of obvious invariants that are "almost true" -- things like `self.left == self.buf.offset` and `self.right == self.buf.offset + self.buf.data.len()` and `self.right_total == self.left_total + self.buf.data.sum()`. The reason these things are "almost true" is the implementation tends to put updating one side of the invariant unreasonably far apart from updating the other side, leaving the invariant broken while unrelated stuff happens in between. The following code from master is an example of this:
In this code the `advance_right` is reserving an entry into which to write a next token on the right side of the ring buffer, the `check_stack` is doing something totally unrelated to the right boundary of the ring buffer, and the `scan_push` is actually writing the token we previously reserved space for. Much of what this PR is doing is rearranging code to shrink the amount of stuff in between when an invariant is broken to when it is restored, until the whole thing can be factored out into one indivisible method call on the RingBuffer type.
The end state of the PR is that we can entirely eliminate `self.left` (because it's now just equal to `self.buf.offset` always) and `self.right` (because it's equal to `self.buf.offset + self.buf.data.len()` always) and the whole `Token::Eof` state which used to be the value of tokens that have been reserved space for but not yet written.
I found without these changes the pretty printer implementation to be hard to reason about and I wasn't able to confidently introduce improvements like trailing commas in `prettyplease` until after this refactor. The logic here is 43 years old at this point (Graydon translated it as directly as possible from the 1979 pretty printing paper) and while there are advantages to following the paper as closely as possible, in `prettyplease` I decided if we're going to adapt the algorithm to work better for Rust syntax, it was worthwhile making it easier to follow than the original.
Matthias Krüger [Wed, 19 Jan 2022 18:19:48 +0000 (19:19 +0100)]
Rollup merge of #92800 - ehuss:docs-fallback, r=Mark-Simulacrum
Add manifest docs fallback.
This adds a fallback so that the rustup manifest will contain the rust-docs component for all hosts. There is a mapping so that the docs that get downloaded are roughly close to the actual host. There inevitably will be things that don't match. Ideally the standard library docs would be the same for every platform (`cfg(doc)` goes a long way towards this), but there are still lots of minor differences.
Matthias Krüger [Wed, 19 Jan 2022 18:19:47 +0000 (19:19 +0100)]
Rollup merge of #92630 - steffahn:lift_bounds_on_BuildHasherDefault, r=yaahc
Change PhantomData type for `BuildHasherDefault` (and more)
Changes `PhantomData<H>` to `PhantomData<fn() -> H>` for `BuildHasherDefault`. This preserves the covariance of `H`, while it lifts the currently inferred unnecessary bounds like [`H: Send` for `BuildHasherDefault<H>: Send`](https://doc.rust-lang.org/1.57.0/std/hash/struct.BuildHasherDefault.html#impl-Send), etc.
_Edit:_ Also does a similar change for `iter::Empty` and `future::Pending`.
Matthias Krüger [Wed, 19 Jan 2022 18:19:45 +0000 (19:19 +0100)]
Rollup merge of #92316 - petrochenkov:extmangle, r=wesleywiser
mangling_v0: Skip extern blocks during mangling
There's no need to include the dummy `Nt` into the symbol name, items in extern blocks belong to their parent modules for all purposes except for inheriting the ABI and attributes.
Follow up to https://github.com/rust-lang/rust/pull/92032
(There's also a drive-by fix to the `rust-demangler` tool's tests, which don't run on CI, I initially attempted using them for testing this PR.)
bors [Wed, 19 Jan 2022 15:01:10 +0000 (15:01 +0000)]
Auto merge of #93069 - matthiaskrgr:rollup-gx1vkp7, r=matthiaskrgr
Rollup of 10 pull requests
Successful merges:
- #88642 (Formally implement let chains)
- #89621 (doc: guarantee call order for sort_by_cached_key)
- #91278 (Use iterator instead of recursion in `codegen_place`)
- #92124 (Little improves in CString `new` when creating from slice)
- #92783 (Annotate dead code lint with notes about ignored derived impls)
- #92797 (Remove horizontal lines at top of page)
- #92920 (Move expr- and item-related pretty printing functions to modules)
- #93041 (Remove some unused ordering derivations based on `DefId`)
- #93051 (Add Option::is_some_with and Result::is_{ok,err}_with)
- #93062 (Update books)
8 commits in f8ba2f12df60ee19b96de24ae5b73af3de8a446b..4dee6eb63d728ffb9e7a2ed443e9ada9275c69d2
2022-01-03 11:02:08 -0800 to 2022-01-18 09:26:33 -0800
- (minor) Remove Expression Path sub-types splits in Pattern specs (rust-lang/reference#1138)
- Document destructuring assignment (rust-lang/reference#1116)
- Document the 2021 edition changes to macros-by-example `pat` metavariables (rust-lang/reference#1135)
- Improve the documentation of macros-by-example metavariable names (rust-lang/reference#1130)
- trait-bounds.md: add pronoun 'that' (rust-lang/reference#1131)
- Say that macros-by-example `ident` metavariables can match raw identifiers (rust-lang/reference#1133)
- State in the UAX31 profile description that a lone `_` is not an identifier (rust-lang/reference#1129)
- Document syntax reserved in Rust 2021 (rust-lang/reference#1128)
## book
17 commits in d3740fb7aad0ea4a80ae20f64dee3a8cfc0c5c3c..f17df27fc14696912c48b8b7a7a8fa49e648088d
2022-01-03 21:46:04 -0500 to 2022-01-18 17:46:28 -0500
- Add a notice to the top of all nostarch snapshots
- Fix quotes
- Grammar (minor): 'or' → 'and' for enum variants
- Propagate edits of chapter 8 to src
- Replies to nostarch edits
- more edits
- ch8 from nostarch
- Fix grammar and line wrapping
- Merge remote-tracking branch 'origin/pr/2880'
- Remove wikipedia link
- Merge remote-tracking branch 'origin/pr/2927'
- Snapshot of ch14 for nostarch
- Backport fixes to chapter 14 noticed while doing nostarch snapshot
- Fix usage of find piped into xargs
- Adjust some more line numbers of Cargo.toml includes
- Merge branch '2909'
- Merge remote-tracking branch 'parkerziegler/fix/ch14-add-one-naming'
## rustc-dev-guide
7 commits in 875464457c4104686faf667f47848aa7b0f0a744..78dd6a4684cf8d6b72275fab6d0429ea40b66338
2021-12-28 22:17:49 -0600 to 2022-01-18 14:44:26 -0300
- Reorganize and expand the testing chapters. (rust-lang/rustc-dev-guide#1281)
- Add inline assembly internals (rust-lang/rustc-dev-guide#1266)
- Spelling: Rename `rust` to `Rust` (rust-lang/rustc-dev-guide#1288)
- Clean up section about FCPs (rust-lang/rustc-dev-guide#1287)
- Address more review comments in rust-lang/rustc-dev-guide#1286.
- Address review comments in rust-lang/rustc-dev-guide#1286.
- Streamline "Getting Started" some more.
Matthias Krüger [Wed, 19 Jan 2022 09:42:19 +0000 (10:42 +0100)]
Rollup merge of #93041 - pierwill:rm-unused-defid-ords, r=cjgillot
Remove some unused ordering derivations based on `DefId`
Like #93018, this removes some unused/unneeded ordering derivations as part of ongoing work on #90317. Here, these changes are aimed at making https://github.com/rust-lang/rust/pull/90749 easier to review, test, and merge.
Matthias Krüger [Wed, 19 Jan 2022 09:42:15 +0000 (10:42 +0100)]
Rollup merge of #92124 - AngelicosPhosphoros:remove_extra_alloc_in_cstring_new_35838, r=Mark-Simulacrum
Little improves in CString `new` when creating from slice
Old code already contain optimization for cases with `&str` and `&[u8]` args. This commit adds a specialization for `&mut[u8]` too.
Also, I added usage of old slice in search for zero bytes instead of new buffer because it produce better code for constant inputs on Windows LTO builds. For other platforms, this wouldn't cause any difference because it calls `libc` anyway.
Inlined `_new` method into spec trait to reduce amount of code generated to `CString::new` callers.
Matthias Krüger [Wed, 19 Jan 2022 09:42:14 +0000 (10:42 +0100)]
Rollup merge of #91278 - SparrowLii:place, r=spastorino
Use iterator instead of recursion in `codegen_place`
This PR fixes the FIXME in `codegen_place` about using iterator instead of recursion when processing the `projection` field in `mir::PlaceRef`. At the same time, it also reduces the right drift.
Matthias Krüger [Wed, 19 Jan 2022 09:42:13 +0000 (10:42 +0100)]
Rollup merge of #89621 - digama0:patch-2, r=yaahc
doc: guarantee call order for sort_by_cached_key
`slice::sort_by_cached_key` takes a caching function `f: impl FnMut(&T) -> K`, which means that the order that calls to the caching function are made is user-visible. This adds a clause to the documentation to promise the current behavior, which is that `f` is called on all elements of the slice from left to right, unless the slice has len < 2 in which case `f` is not called.
For example, this can be used to ensure that the following code is a correct way to involve the index of the element in the sort key:
```rust
let mut index = 0;
slice.sort_by_cached_key(|x| (my_key(index, x), index += 1).0);
```
Matthias Krüger [Wed, 19 Jan 2022 09:42:12 +0000 (10:42 +0100)]
Rollup merge of #88642 - c410-f3r:let_chains_2, r=matthewjasper
Formally implement let chains
## Let chains
My longest and hardest contribution since #64010.
Thanks to `@Centril` for creating the RFC and special thanks to `@matthewjasper` for helping me since the beginning of this journey. In fact, `@matthewjasper` did much of the complicated MIR stuff so it's true to say that this feature wouldn't be possible without him. Thanks again `@matthewjasper!`
With the changes proposed in this PR, it will be possible to chain let expressions along side local variable declarations or ordinary conditional expressions. In other words, do much of what the `if_chain` crate already does.
## Other considerations
* `if let guard` and `let ... else` features need special care and should be handled in a following PR.
* Irrefutable patterns are allowed within a let chain context
* ~~Three Clippy lints were already converted to start dogfooding and help detect possible corner cases~~
bors [Wed, 19 Jan 2022 06:17:07 +0000 (06:17 +0000)]
Auto merge of #93063 - ehuss:update-cargo, r=ehuss
Update cargo
16 commits in 358e79fe56fe374649275ca7aebaafd57ade0e8d..95bb3c92bf516017e812e7f1c14c2dea3845b30e
2022-01-04 18:39:45 +0000 to 2022-01-18 17:39:35 +0000
- Error when setting crate type of both dylib and cdylib in library (rust-lang/cargo#10243)
- Include `help` in `--list` (rust-lang/cargo#10300)
- Add report subcommand to bash completion. (rust-lang/cargo#10295)
- Downgrade some log messages. (rust-lang/cargo#10296)
- Enable shortcut for triage bot (rust-lang/cargo#10298)
- Bump to 0.61.0, update changelog (rust-lang/cargo#10294)
- use new cargo fmt option (rust-lang/cargo#10291)
- Add `run-fail` to semver-check for docs (rust-lang/cargo#10287)
- Use `is_symlink()` method (rust-lang/cargo#10290)
- Stabilize namespaced and weak dependency features. (rust-lang/cargo#10269)
- Port cargo to clap3 (rust-lang/cargo#10265)
- feat: support rustflags per profile (rust-lang/cargo#10217)
- Make bors ignore the PR template so it doesn't end up in merge messages (rust-lang/cargo#10267)
- Be resilient to most IO error and filesystem loop while walking dirs (rust-lang/cargo#10214)
- Remove the option to disable pipelining (rust-lang/cargo#10258)
- Always ask rustc for messages about artifacts, and always process them (rust-lang/cargo#10255)
Eric Holk [Wed, 5 Jan 2022 22:11:37 +0000 (14:11 -0800)]
Safely handle partial drops
We previously weren't tracking partial re-inits while being too
aggressive around partial drops. With this change, we simply ignore
partial drops, which is the safer, more conservative choice.
Eric Holk [Fri, 17 Dec 2021 23:05:38 +0000 (15:05 -0800)]
Update async-fn-nonsend.rs
The previous commit made the non_sync_with_method_call case pass due to
the await being unreachable. Unfortunately, this isn't actually the
behavior the test was verifying. This change lifts the panic into a
helper function so that the generator analysis still thinks the await
is reachable, and therefore we preserve the same testing behavior.
Eric Holk [Fri, 17 Dec 2021 22:36:51 +0000 (14:36 -0800)]
Handle uninhabited return types
This changes drop range analysis to handle uninhabited return types such
as `!`. Since these calls to these functions do not return, we model
them as ending in an infinite loop.
Eric Holk [Fri, 17 Dec 2021 01:15:35 +0000 (17:15 -0800)]
Track changed bitsets in CFG propagation
This reduces the amount of work done, especially in later iterations,
by only processing nodes whose predecessors changed in the previous
iteration, or earlier in the current iteration. This also has the side
effect of completely ignoring all unreachable nodes.
Eric Holk [Thu, 16 Dec 2021 00:00:48 +0000 (16:00 -0800)]
More comments and refactoring
The refactoring mainly keeps the separation between the modules clearer.
For example, process_deferred_edges function moved to cfg_build.rs since
that is really part of building the CFG, not finding the fixpoint.
Also, we use PostOrderId instead of usize in a lot more places now.
Eric Holk [Mon, 13 Dec 2021 18:47:28 +0000 (10:47 -0800)]
Refactor drop_ranges
Splits drop_ranges into drop_ranges::record_consumed_borrow,
drop_ranges::cfg_build, and drop_ranges::cfg_propagate. The top level
drop_ranges module has an entry point that does all the coordination of
the other three phases, using code original in generator_interior.
Eric Holk [Thu, 28 Oct 2021 00:46:08 +0000 (17:46 -0700)]
Support conditional drops
This adds support for branching and merging control flow and uses this
to correctly handle the case where a value is dropped in one branch of
an if expression but not another.
There are other cases we need to handle, which will come in follow up
patches.
Eric Holk [Tue, 26 Oct 2021 00:01:24 +0000 (17:01 -0700)]
Attribute drop to parent expression of the consume point
This is needed to handle cases like `[a, b.await, c]`. `ExprUseVisitor`
considers `a` to be consumed when it is passed to the array, but the
array is not quite live yet at that point. This means we were missing
the `a` value across the await point. Attributing drops to the parent
expression means we do not consider the value consumed until the
consuming expression has finished.
Eric Holk [Fri, 22 Oct 2021 22:49:38 +0000 (15:49 -0700)]
Make generator and async-await tests pass
The main change needed to make this work is to do a pessimistic over-
approximation for AssignOps. The existing ScopeTree analysis in
region.rs works by doing both left to right and right to left order and
then choosing the most conservative ordering. This behavior is needed
because AssignOp's evaluation order depends on whether it is a primitive
type or an overloaded operator, which runs as a method call.
This change mimics the same behavior as region.rs in
generator_interior.rs.
Eric Holk [Wed, 20 Oct 2021 23:42:53 +0000 (16:42 -0700)]
Track drop points in generator_interior
This change adds the basic infrastructure for tracking drop ranges in
generator interior analysis, which allows us to exclude dropped types
from the generator type.
Not yet complete, but many of the async/await and generator tests pass.
The main missing piece is tracking branching control flow (e.g. around
an `if` expression). The patch does include support, however, for
multiple yields in th e same block.
Matthias Krüger [Tue, 18 Jan 2022 21:00:52 +0000 (22:00 +0100)]
Rollup merge of #93035 - Amanieu:stdarch_fix, r=Mark-Simulacrum
Fix stdarch submodule pointing to commit outside tree
PR #93016 was merged with the stdarch submodule pointing to a commit in
a PR branch and not in master. This was due to a circular dependency
between the rust and stdarch changes which would cause the other to fail
to build.
Matthias Krüger [Tue, 18 Jan 2022 21:00:50 +0000 (22:00 +0100)]
Rollup merge of #93018 - pierwill:rm-unused-ord, r=davidtwco
Remove some unused `Ord` derives based on `Span`
Remove some `Ord`, `PartialOrd` derivations that rely on underlying ordering of `Span`. These ordering traits appear to be unused right now.
If we're going to attempt to remove ordering traits from `Span` as suggested in https://github.com/rust-lang/rust/issues/90317#issuecomment-1013980591, we might want to slowly remove code that depends on this ordering (as opposed to the all-at-once approach in https://github.com/rust-lang/rust/pull/90749 and https://github.com/rust-lang/rust/pull/90408).
Matthias Krüger [Tue, 18 Jan 2022 21:00:49 +0000 (22:00 +0100)]
Rollup merge of #92924 - dtolnay:pptracing, r=Mark-Simulacrum
Delete pretty printer tracing
These are left over from 2011. I did not find these helpful at all in my work on https://github.com/dtolnay/prettyplease despite doing significant refactors to this code. Learning what these messages all refer to is harder than putting in your own messages to log exactly what is relevant to specifically the thing that you are working on debugging.
Matthias Krüger [Tue, 18 Jan 2022 21:00:47 +0000 (22:00 +0100)]
Rollup merge of #92780 - b-naber:postpone-const-eval-coherence, r=lcnr
Directly use ConstValue for single literals in blocks
Addresses the minimal repro in https://github.com/rust-lang/rust/issues/92186, but doesn't fix the underlying problem (which would be solved by solving the anon subst problem afaict).
I do, however, think that it makes sense in general to treat single literals in anon blocks as const values directly, especially in light of the problem that the issue refers to (anon const evaluation being postponed until infer variables in substs can be resolved, which was introduced by https://github.com/rust-lang/rust/pull/90023), i.e. while we do get warnings for those unnecessary braces, we should try to avoid errors caused by those braces if possible.
Matthias Krüger [Tue, 18 Jan 2022 21:00:46 +0000 (22:00 +0100)]
Rollup merge of #92692 - jsha:cool-sidebar, r=GuillaumeGomez
Simplify and unify rustdoc sidebar styles
Fixes #59860
This switches to just use size, weight, and spacing to distinguish headings in the sidebar. We no longer use boxes, horizontal bars, or centering to distinguish headings. This makes it much easier to understand the hierarchy of headings, and reduces visual noise.
I also refactored how the mobile topbar works. Previously, we tried to shift around elements from the sidebar to make the topbar. Now, the topbar gets its own elements, which can be styled on their own. This makes styling and reasoning about those elements simpler.
Because the heading font sizes are bigger, increase the sidebar width slightly.
As a very minor change, removed version from the "All types" page. It's now only on the crate page.
struct - https://rustdoc.crud.net/jsha/cool-sidebar/std/vec/struct.Vec.html
trait - https://rustdoc.crud.net/jsha/cool-sidebar/std/io/trait.Read.html
crate - https://rustdoc.crud.net/jsha/cool-sidebar/std/index.html
mod - https://rustdoc.crud.net/jsha/cool-sidebar/std/any/index.html
macro - https://rustdoc.crud.net/jsha/cool-sidebar/std/macro.panic.html
fn - https://rustdoc.crud.net/jsha/cool-sidebar/std/io/fn.stdin.html
type alias - https://rustdoc.crud.net/jsha/cool-sidebar/std/io/type.Result.html
keyword - https://rustdoc.crud.net/jsha/cool-sidebar/std/keyword.as.html
primitive - https://rustdoc.crud.net/jsha/cool-sidebar/std/primitive.pointer.html
r? `@GuillaumeGomez`
cc `@camelid`
[Discussed on Zulip](https://rust-lang.zulipchat.com/#narrow/stream/266220-rustdoc/topic/sidebar.20headings).
Note: This has a lot of smaller commits, but I plan to squash them before merging.
Matthias Krüger [Tue, 18 Jan 2022 21:00:45 +0000 (22:00 +0100)]
Rollup merge of #92425 - calebzulawski:simd-cast, r=workingjubilee
Improve SIMD casts
* Allows `simd_cast` intrinsic to take `usize` and `isize`
* Adds `simd_as` intrinsic, which is the same as `simd_cast` except for saturating float-to-int conversions (matching the behavior of `as`).
Matthias Krüger [Tue, 18 Jan 2022 21:00:43 +0000 (22:00 +0100)]
Rollup merge of #91150 - dtolnay:qpath, r=davidtwco
Let qpath contain NtTy: `<$:ty as $:ty>::…`
Example:
```rust
macro_rules! m {
(<$type:ty as $trait:ty>::$name:ident) => {
<$type as $trait>::$name
};
}
fn main() {
let _: m!(<str as ToOwned>::Owned);
}
```
Previous behavior:
```console
error: expected identifier, found `ToOwned`
--> src/main.rs:3:19
|
3 | <$type as $trait>::$name
| ^^^^^^ expected identifier
...
8 | let _: m!(<str as ToOwned>::Owned);
| ---------------------------
| |
| this macro call doesn't expand to a type
| in this macro invocation
```
The <code>expected identifier, found \`ToOwned\`</code> error is particularly silly. I think it should be fine to accept this code as long as $trait is of the form `TyKind::Path(None, path)`; if it is any other kind of `NtTy`, we'll keep the same behavior as before.
Matthias Krüger [Tue, 18 Jan 2022 21:00:42 +0000 (22:00 +0100)]
Rollup merge of #90782 - ricobbe:binutils-dlltool, r=michaelwoerister
Implement raw-dylib support for windows-gnu
Add support for `#[link(kind = "raw-dylib")]` on windows-gnu targets. Work around binutils's linker's inability to read import libraries produced by LLVM by calling out to the binutils `dlltool` utility to create an import library from a temporary .DEF file; this approach is effectively a slightly refined version of `@mati865's` earlier attempt at this strategy in PR #88801. (In particular, this attempt at this strategy adds support for `#[link_ordinal(...)]` as well.)