Rollup of 6 pull requests
Successful merges:
- #132355 (Fix compiler panic with a large number of threads)
- #132486 (No need to instantiate binder in `confirm_async_closure_candidate`)
- #132544 (Use backticks instead of single quotes for library feature names in diagnostics)
- #132559 (find the generic container rather than simply looking up for the assoc with const arg)
- #132579 (add rustc std workspace crate sources)
- #132583 (Suggest creating unary tuples when types don't match a trait)
r? `@ghost`
`@rustbot` modify labels: rollup
Suggest creating unary tuples when types don't match a trait
When you want to have a variadic function, a common workaround to implement this is to create a trait and then implement that trait for various tuples. For example in `pyo3` there exists
```rust
/// Calls the object with only positional arguments.
pub fn call1(&self, args: impl IntoPy<Py<PyTuple>>) -> PyResult<&PyAny> {
...
}
```
with various impls like
```rust
impl<A: IntoPy<PyObject> IntoPy<Py<PyAny>> for (A,)
impl<A: IntoPy<PyObject, B: IntoPy<PyObject> IntoPy<Py<PyAny>> for (A, B)
... etc
```
This means that if you want to call the method with a single item you have to create a unary tuple, like `(x,)`, rather than just `x`.
This PR implements a suggestion to do that, if applicable.
add rustc std workspace crate sources
This adds the sources for the crates listed at https://crates.io/search?q=rustc-std-workspace in this repo. The first commit adds the original sources as downloaded from crates.io (with `Cargo.toml.orig` moved back over `Cargo.toml`), and adds a README explaining what this is about. The 2nd commit updates the sources to make the core and alloc crates re-exports of the "actual" core and alloc crates, as was already the case with `std`, and also adds a `repository` link to the manifest so one can figure out where to find these crates.
I bumped the version for the core and alloc crates in the hope that the new versions can be published on crates.io shortly after this PR lands.
See [Zulip](https://rust-lang.zulipchat.com/#narrow/channel/219381-t-libs/topic/rustc-std-workspace-core.20crate.20is.20empty) for a bit more context.
r? `@Amanieu`
find the generic container rather than simply looking up for the assoc with const arg
Fixes#132534
This issue is caused by mismatched generic parameters. Previously, it tried to find `T` in `trait X`, but after this change, it will find `T` in `fn a`.
r? `@compiler-errors` as this assertion was introduced by you.
Use backticks instead of single quotes for library feature names in diagnostics
This PR changes the text of library feature errors for using unstable or body-unstable items. Displaying library feature names in backticks is consistent with other diagnostics (e.g. those from `rustc_passes`) and with the `reason`s on unstable attributes in the library. Additionally, this simplifies diagnostics when supporting multiple unstable attributes on items (see #131824) since `DiagSymbolList` also displays symbols using backticks.
Register `~const` preds for `Deref` adjustments in HIR typeck
This doesn't *do* anything yet, since `Deref` and `DerefMut` aren't constified, and we explicitly don't error on calling non-const trait methods in HIR yet -- presumably that will wait until std is re-constified. But I'm confident this logic is correct, and this (afaict?) is the only major hole left in enforcing `~const` in HIR typeck.
r? fee1-dead
- Store a mut ref to a `BorrowckDiags` in `MirBorrowckCtxt` instead of
owning it, to save having to pass ownership in and out of
`promoted_mbcx`.
- Use `buffer_error` in a couple of suitable places.
Because there is no real reason for it to be a separate struct.
- It has no methods.
- It's easy to confuse with the nearby `BorrowckInferContext` (which
does have methods).
- The `mut` ref to it in `TypeChecker` makes it seem like any of the
fields within might be mutable, but only two (`all_facts` and
`constraints`) actually are.
- Two of the fields are `pub(crate)` but can be private.
This change makes a lot of code more concise and readable.
It's strange to have a struct that contains a single anonymous field
that is an enum. This commit merges them. This does require increasing
the visibility of `TypeOfInfo` to `pub(crate)`, but that seems
worthwhile.
