update `cfg_select!` documentation
tracking issue: https://github.com/rust-lang/rust/issues/115585
After rust-lang/rust#143461, and with an eye on a soon(ish) stabilization, I think the docs need some work.
The existing text read more like a motivation for the feature existing to me, so I've tried to now be a bit more descriptive. Still, suggestions are very welcome.
I also added a test for an empty `select! {}` because it's just the sort of thing that might break.
r? ``@traviscross``
make `cfg_select` a builtin macro
tracking issue: https://github.com/rust-lang/rust/issues/115585
This parses mostly the same as the `macro cfg_select` version, except:
1. wrapping in double brackets is no longer supported (or needed): `cfg_select {{ /* ... */ }}` is now rejected.
2. in an expression context, the rhs is no longer wrapped in a block, so that this now works:
```rust
fn main() {
println!(cfg_select! {
unix => { "foo" }
_ => { "bar" }
});
}
```
3. a single wildcard rule is now supported: `cfg_select { _ => 1 }` now works
I've also added an error if none of the rules evaluate to true, and warnings for any arms that follow the `_` wildcard rule.
cc `@traviscross` if I'm missing any feature that should/should not be included
r? `@petrochenkov` for the macro logic details
const-block-as-pattern: do not refer to no-longer-existing nightly feature
Surely everyone who used this nightly feature has fixed their code by now. So let's not confused people on stable that try to use a const block as a pattern by referring to some dead nightly feature.
Fix some comments and related types and locals where it is obvious, e.g.
- bare_fn -> fn_ptr
- LifetimeBinderKind::BareFnType -> LifetimeBinderKind::FnPtrType
Co-authored-by: León Orell Valerian Liehr <me@fmease.dev>
Rollup of 11 pull requests
Successful merges:
- rust-lang/rust#131923 (Derive `Copy` and `Hash` for `IntErrorKind`)
- rust-lang/rust#138340 (Remove some unsized tuple impls now that we don't support unsizing tuples anymore)
- rust-lang/rust#141219 (Change `{Box,Arc,Rc,Weak}::into_raw` to only work with `A = Global`)
- rust-lang/rust#142212 (bootstrap: validate `rust.codegen-backends` & `target.<triple>.codegen-backends`)
- rust-lang/rust#142237 (Detect more cases of unused_parens around types)
- rust-lang/rust#142964 (Attribute rework: a parser for single attributes without arguments)
- rust-lang/rust#143070 (Rewrite `macro_rules!` parser to not use the MBE engine itself)
- rust-lang/rust#143235 (Assemble const bounds via normal item bounds in old solver too)
- rust-lang/rust#143261 (Feed `explicit_predicates_of` instead of `predicates_of`)
- rust-lang/rust#143276 (loop match: handle opaque patterns)
- rust-lang/rust#143306 (Add `track_caller` attributes to trace origin of Clippy lints)
r? `@ghost`
`@rustbot` modify labels: rollup
try-job: aarch64-apple
try-job: x86_64-msvc-1
try-job: x86_64-gnu
try-job: dist-i586-gnu-i586-i686-musl
try-job: test-various
Remove let_chains unstable feature
Per https://github.com/rust-lang/rust/issues/53667#issuecomment-3016742982 (but then I also noticed rust-lang/rust#140722)
This replaces the feature gate with a parser error that says let chains require 2024.
A lot of tests were using the unstable feature. I either added edition:2024 to the test or split out the parts that require 2024.
New const traits syntax
This PR only affects the AST and doesn't actually change anything semantically.
All occurrences of `~const` outside of libcore have been replaced by `[const]`. Within libcore we have to wait for rustfmt to be bumped in the bootstrap compiler. This will happen "automatically" (when rustfmt is run) during the bootstrap bump, as rustfmt converts `~const` into `[const]`. After this we can remove the `~const` support from the parser
Caveat discovered during impl: there is no legacy bare trait object recovery for `[const] Trait` as that snippet in type position goes down the slice /array parsing code and will error
r? ``@fee1-dead``
cc ``@nikomatsakis`` ``@traviscross`` ``@compiler-errors``
Implement parsing of pinned borrows
This PR implements part of #130494.
EDIT: It introduces `&pin mut $place` and `&pin const $place` as sugars for `std::pin::pin!($place)` and its shared reference equivalent, except that `$place` will not be moved when borrowing. The borrow check will be in charge of enforcing places cannot be moved or mutably borrowed since being pinned till dropped.
### Implementation steps:
- [x] parse the `&pin mut $place` and `&pin const $place` syntaxes
- [ ] borrowck of `&pin mut|const`
- [ ] support autoref of `&pin mut|const` when needed
Fix incorrect eq_unspanned in TokenStream
Fixesrust-lang/rust#141522
r? ``@workingjubilee``
should we remove this function?
since it's used in several places, i'd prefer to keep it.
Remove `Path::is_ident`.
It checks that a path has a single segment that matches the given symbol, and that there are zero generic arguments. It has a single use.
We also have `impl PartialEq<Symbol> for Path` which does exactly the same thing *except* it doesn't check for zero generic arguments, which seems like an oversight. It has numerous uses.
This commit removes `Path::is_ident`, adds a test for zero generic arguments to `PartialEq<Symbol> for Path`, and changes the single use of `is_ident` to instead use `==`.
r? `@wesleywiser`
This adds an `iter!` macro that can be used to create movable
generators.
This also adds a yield_expr feature so the `yield` keyword can be used
within iter! macro bodies. This was needed because several unstable
features each need `yield` expressions, so this allows us to stabilize
them separately from any individual feature.
Co-authored-by: Oli Scherer <github35764891676564198441@oli-obk.de>
Co-authored-by: Jieyou Xu <jieyouxu@outlook.com>
Co-authored-by: Travis Cross <tc@traviscross.com>
It checks that a path has a single segment that matches the given
symbol, and that there are zero generic arguments. It has a single use.
We also have `impl PartialEq<Symbol> for Path` which does exactly the
same thing *except* it doesn't check for zero generic arguments, which
seems like an oversight. It has numerous uses.
This commit removes `Path::is_ident`, adds a test for zero generic
arguments to `PartialEq<Symbol> for Path`, and changes the single use of
`is_ident` to instead use `==`.
Reorder `ast::ItemKind::{Struct,Enum,Union}` fields.
So they match the order of the parts in the source code, e.g.:
```
struct Foo<T, U> { t: T, u: U }
<-><----> <------------>
/ | \
ident generics variant_data
```
r? `@fee1-dead`
Fix ICE in tokenstream with contracts from parser recovery
Fixesrust-lang/rust#140683
After two times of parsing error, the `recover_stmt_` constructs an error ast, then when we expand macors, the invalid tokenstream triggered ICE because of mismatched delims.
Expected `{` and get other tokens is an obvious error message, too much effort on recovery may introduce noise.
r? ```@nnethercote```
So they match the order of the parts in the source code, e.g.:
```
struct Foo<T, U> { t: T, u: U }
<-><----> <------------>
/ | \
ident generics variant_data
```
