Split `SelectionContext::select` into fns that take a binder and don't
*most* usages of `SelectionContext::select` don't need to use a binder, but wrap them in a dummy because of the signature. Let's split this out into `SelectionContext::{select,poly_select}` and limit the usages of the latter.
Right now, we only have 3 places where we're calling `poly_select` -- fulfillment, internally within the old solver, and the auto-trait finder.
r? `@lcnr`
Rollup of 8 pull requests
Successful merges:
- #111917 (Simplify duplicate checks for mir validator)
- #112008 (Fix incorrect documented default bufsize in bufreader/writer)
- #112825 (Don't call `type_of` on TAIT in defining scope in new solver)
- #113164 (Add a regression test for #109054)
- #113318 (Revert "alloc: Allow comparing Boxs over different allocators", add regression test)
- #113397 (Prefer object candidates in new selection)
- #113419 (Avoid calling item_name for RPITIT)
- #113421 (Do not assert >1 RPITITs on collect_return_position_impl_trait_in_trait_tys)
r? `@ghost`
`@rustbot` modify labels: rollup
Do not assert >1 RPITITs on collect_return_position_impl_trait_in_trait_tys
Fixes#113403
Assert on collect_return_position_impl_trait_in_trait_tys is not correct when we call it from type_of(GAT). The included test is an example of a situation that collector collects 0 types.
r? `@compiler-errors`
Prefer object candidates in new selection
`dyn Any` shouldn't be using [this implementation](https://doc.rust-lang.org/std/any/trait.Any.html#impl-Any-for-T) during codegen.
Prefer object candidates over other candidates, except for other object candidates.
Revert "alloc: Allow comparing Boxs over different allocators", add regression test
Temporary fix for #113283
Adds a test to fix the regression introduced in 001b081cc1 and revert that commit. The test fails without the revert.
Don't call `type_of` on TAIT in defining scope in new solver
It's *never* productive to call `consider_auto_trait_candidate` on a TAIT in the defining scope, since it will always lead to a query cycle since we call `type_of` on the TAIT. So let's just don't.
I've reserved this behavior just to `SolverMode::Normal` just to avoid any future problems, since this is *technically* incomplete since we're discarding a candidate that could *theoretically* apply. But given such candidate assembly *always* leads to a query cycle, I think it's relatively low risk, and I could be convinced otherwise and make this apply to both solver mode. I assume it's far less likely to be encountered in coherence, though.
This is much more likely to encounter in the new solver, though it can also be encountered in the old solver too, so I'm happy to discuss whether this new behavior we even want in the first place...
I encountered this in a couple of failing UI tests:
* `tests/ui/type-alias-impl-trait/issue-62000-associate-impl-trait-lifetimes.rs`
* `tests/ui/type-alias-impl-trait/issue-93411.rs`
r? `@lcnr`
Use `llvm-config` instead of `download-ci-llvm` in PGO script
This should avoid CI breakage when the LLVM stamp is updated, and also it will avoid an unnecessary LLVM download from CI.
r? `@jyn514`
Dont ICE for `dyn* Trait: Trait` (built-in object) goals during selection in new trait solver
We were ICEing too eagerly during selection for `dyn*` goals -- both for dyn unsizing candidates and for built-in object candidates. The former should only be performed on `dyn` objects, but the latter are totally fine.
fix compiletest crash
### Motivation
When running compiler-tests locally for the `wasm32` platform, one test repeatedly crashed. It does not crash on the CI, only locally. Investigation shows that the `compiletest` itself crashes
> panicked-at-attempt-to-subtract-with-overflow
```rust
let mut head = replace(bytes, Vec::new());
let mut middle = head.split_off(HEAD_LEN);
// The following line will panic
let tail = middle.split_off(middle.len() - TAIL_LEN).into_boxed_slice();
let skipped = new_len - HEAD_LEN - TAIL_LEN;
```
### Background
The code in question collects the output of a process. Small output is kept completely, but larger output is kept only partially: the first 160 kB and the last 256 kB.
The code that performs this split crashes if the data size is less than 416 kB. There is an early out based on the "filtered" length, but it is possible that the filtered length is greater than the real length. It seems that this code was written with the assumption that the filtered length is larger than the real length, which is not true in general.
When running CI tests locally using `src/ci/docker/run.sh`, the filtered folder is `/checkout`, which is shorter than the placeholder length of 32 bytes.
### Note
This PR should not change any behaviour. It only adds an early our for a case which will definitely crash (at least if compiletest is build with integer checks).
Note that an early out makes sense here: If the real data is too small, it does not sense to split it.
Fix the tests-listing-format-json test on Windows
tests/ui/test-attrs/tests-listing-json-format.rs was failing on Windows because each path in the json-formatted output contained "\\\\" instead of "\\". `runtest::TestCx::normalize_output` already checks the compile flags for json-related arguments to handle this case, so I added an equivalent check for the new run flag.
