Consolidate WF for aliases
Make RPITs/TAITs/weak (type) aliases/projections all enforce:
1. their nominal predicates
2. their args are WF
This possibly does extra work, but is also nice for consistency sake.
r? lcnr
`break` doesn't require a loop, so note this in the docs.
This is covered in the linked sections of the rust reference,
but this page implied that `break` is only for loops.
We can (and will) support analyzing the transmutability of types
whose layouts aren't completely specified by its repr. This change
ensures that the error messages remain sensible after this support
lands.
hir: Remove `opt_local_def_id_to_hir_id` and `opt_hir_node_by_def_id`
Also replace a few `hir_node()` calls with `hir_node_by_def_id()`.
Follow up to https://github.com/rust-lang/rust/pull/120943.
Cursor.rs documentation fix
Reason:
I've been learning Rust std library and got confused. Seek trait documentation clearly states that negative indexes will cause an error. And the code in the Cursor example uses negative index. I found myself trying to understand what am I missing until I've actually executed the code and got error. I decided to submit small fix to the documentation.
Cleanup `MirBorrowckCtxt::prefixes`
Some of the uses of this method aren't necessary anymore and `PrefixSet::Supporting` is not used anywhere.
With `PrefixSet::Supporting` removed, this could technically be moved to an extension trait on `PlaceRef`. However, it would have to be moved back to `MirBorrowckCtxt` when the `Derefer` MIR pass is moved before borrowck so I didn't.
rustdoc: add `--test-builder-wrapper` arg to support wrappers such as RUSTC_WRAPPER when building doctests
Currently, `rustdoc` builds test crates with `rustc` directly instead of using [`RUSTC_WRAPPER`](https://doc.rust-lang.org/cargo/reference/config.html#buildrustc-wrapper) (if any is set).
This causes build issues in build systems that use `cargo` but tweak linking flags by setting the `RUSTC_WRAPPER` environment variable.
This change is not meant to be final--it's only a minimal proof of concept.
Please advise on the best way to proceed.
Open questions:
- [x] Does supporting the `rustc` wrappers make sense?
- yes, `cargo-miri` for example needs a "hack" to workaround the issue
- [X] What environment variable(s) should be read for the rustc wrapper? Should `rustdoc` [use the same names as `cargo`](https://doc.rust-lang.org/cargo/reference/config.html#buildrustc-wrapper)?
- None, since `rustdoc` takes arguments
- [X] What name should be used for a `rustdoc` CLI option?
- `--test-builder-wrapper`
- [X] Should a separate workspace wrapper (like `RUSTC_WORKSPACE_WRAPPER`) be supported?
- `--test-builder-wrapper` can be passed multiple times to get multiple wrappers passed
- [X] How/where should this be documented? It's not obvious to all users that `cargo doc` actually causes `rustdoc` to compile tests with rust
- Added doc to `src/doc/rustdoc/src/command-line-arguments.md` per `@GuillaumeGomez`
link.exe: Don't embed full path to PDB file in binary.
This PR makes `rustc` unconditionally pass `/PDBALTPATH:%_PDB%` to MSVC-style linkers, causing the linker to only embed the filename of the PDB in the binary instead of the full path. This will help implement the [trim-paths RFC](https://github.com/rust-lang/rust/issues/111540) for `*-msvc` targets.
Passing `/PDBALTPATH:%_PDB%` to the linker is already done by many projects that need reproducible builds and [debugger's should still be able to find the PDB](https://learn.microsoft.com/cpp/build/reference/pdbpath) if it is in the same directory as the binary.
r? `@ghost`
Fixes https://github.com/rust-lang/rust/issues/87825
Clean up AstConv
Split off from #120926 to make it only contain the renaming & (doc) comment updates.
Any changes other than that which have accumulated over time are now part of this PR.
Let's be disciplined ;) Inspired by https://github.com/rust-lang/rust/pull/120926#issuecomment-1997984483.
---
* Remove `hir_trait_to_predicates`
* Unused since #113671
* Inline `create_args_for_ast_trait_ref`
* Only had a single call site
* Having it as a separate method didn't gain us anything
* Use an if-let guard somewhere to avoid unwrapping
* Avoid explicit trait object lifetimes
* More legible, stylistic-only (the updated code is 100% semantically identical)
* Use explicitly elided lifetimes in impl headers, they get elaborated to distinct lifetimes
* Make use of [object lifetime defaulting](https://doc.rust-lang.org/reference/lifetime-elision.html#default-trait-object-lifetimes) for a trait object type inside of a reference type somewhere
* Use preexisting dedicated method `ItemCtxt::to_ty` over `<dyn AstConv<'_>>::ast_ty_to_ty`
* Use preexisting dedicated method `AstConv::astconv` over explicit coercions
* Simplify the function signature of `create_args_for_ast_path` and of `check_generic_arg_count`
* In both cases redundant information was passed rendering the call sites verbose and confusing
* No perf impact (tested in [#120926](https://github.com/rust-lang/rust/pull/120926))
* Move diagnostic method `report_ambiguous_associated_type` from `astconv` to `astconv::errors`
* The submodule `errors` exists specifically for that purpose
* Use it to keep the main module clean & short
Docs for `thir::ExprKind::Use` and `thir::ExprKind::Let`
These docs are based on my own recent investigations; hopefully they're reasonably accurate.
`Use` was particularly puzzling to me at first, since the name is not very suggestive, and the old docs were quite cryptic.
Ensure RPITITs are created before def-id freezing
From the test:
```rust
// `ty::Error` in a trait ref will silence any missing item errors, but will also
// prevent the `associated_items` query from being called before def ids are frozen.
```
Essentially, the code that checks that `impl`s have all their items (`check_impl_items_against_trait`) is also (implicitly) responsible for fetching the `associated_items` query before, but since we early return here:
c2901f5435/compiler/rustc_hir_analysis/src/check/check.rs (L732-L737)
...that means that this never happens for trait refs that reference errors.
Fixes#122518
r? oli-obk
preserve span when evaluating mir::ConstOperand
This lets us show to the user where they were using the faulty const (which can be quite relevant when generics are involved).
I wonder if we should change "erroneous constant encountered" to something like "the above error was encountered while evaluating this constant" or so, to make this more similar to what the collector emits when showing a "backtrace" of where things get monomorphized? It seems a bit strange to rely on the order of emitted diagnostics for that but it seems the collector already [does that](da8a8c9223/compiler/rustc_monomorphize/src/collector.rs (L472-L475)).
Add `-Z external-clangrt`
This adds the unstable `-Z external-clangrt` flag that will prevent rustc from emitting linker paths for the in-tree LLVM sanitizer runtime library.
Instead of executing the test builder directly, the test builder wrapper
will be called with test builder as the first argument and subsequent
arguments. This is similar to cargo's RUSTC_WRAPPER argument.
The `--test-builder-wrapper` argument can be passed multiple times to
allow "nesting" of wrappers.
