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match lowering: expand or-candidates mixed with candidates above
This PR tweaks match lowering of or-patterns. Consider this:
```rust
match (x, y) {
(1, true) => 1,
(2, false) => 2,
(1 | 2, true | false) => 3,
(3 | 4, true | false) => 4,
_ => 5,
}
```
One might hope that this can be compiled to a single `SwitchInt` on `x` followed by some boolean checks. Before this PR, we compile this to 3 `SwitchInt`s on `x`, because an arm that contains more than one or-pattern was compiled on its own. This PR groups branch `3` with the two branches above, getting us down to 2 `SwitchInt`s on `x`.
We can't in general expand or-patterns freely, because this interacts poorly with another optimization we do: or-pattern simplification. When an or-pattern doesn't involve bindings, we branch the success paths of all its alternatives to the same block. The drawback is that in a case like:
```rust
match (1, true) {
(1 | 2, false) => unreachable!(),
(2, _) => unreachable!(),
_ => {}
}
```
if we used a single `SwitchInt`, by the time we test `false` we don't know whether we came from the `1` case or the `2` case, so we don't know where to go if `false` doesn't match.
Hence the limitation: we can process or-pattern alternatives alongside candidates that precede it, but not candidates that follow it. (Unless the or-pattern is the only remaining match pair of its candidate, in which case we can process it alongside whatever).
This PR allows the processing of or-pattern alternatives alongside candidates that precede it. One benefit is that we now process or-patterns in a single place in `mod.rs`.
r? ``@matthewjasper``
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Migrate `bin-emit-no-symbols` `run-make` test to `rmake`
Part of #121876 and the associated [Google Summer of Code project](https://blog.rust-lang.org/2024/05/01/gsoc-2024-selected-projects.html).
try-job: x86_64-msvc
try-job: armhf-gnu
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Suggest removing unused tuple fields if they are the last fields
Fixes #124556
We now check if dead/unused fields are the last fields of the tuple and suggest their removal instead of suggesting them to be changed to `()`.
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Test that opaque types can't have themselves as a hidden type with incompatible lifetimes
fixes #122876
This PR used to add extra logic to prevent those cases, but after https://github.com/rust-lang/rust/pull/113169 this is implicitly rejected, because such usages are not defining.
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Update cargo
13 commits in a1f47ec3f7cd076986f1bfcd7061f2e8cb1a726e..3ed207e416fb2f678a40cc79c02dcf4f936a21ce
2024-06-15 01:10:07 +0000 to 2024-06-18 19:18:22 +0000
- test: prefer raw string for regex reduction (rust-lang/cargo#14099)
- test: migrate tree and tree_graph_features to snapbox (rust-lang/cargo#14094)
- test: Migrate some files to snapbox (rust-lang/cargo#14069)
- remove some legacy public dependency code from the resolver (rust-lang/cargo#14090)
- fix(fix): Address problems with implicit -> explicit feature migration (rust-lang/cargo#14018)
- refactor: 1.79 cleanup (rust-lang/cargo#14088)
- test: migrate `git_(gc|shallow)` to snapbox (rust-lang/cargo#14087)
- test: migrate timings_works to snapbox (rust-lang/cargo#14082)
- test: migrate minimal_versions to snapbox (rust-lang/cargo#14080)
- Remove `run_expect_error` to avoid tests incorrectly passing (rust-lang/cargo#14078)
- test: migrate help to snapbox (rust-lang/cargo#14060)
- test: Migrate tests/testsuite/co*.rs to snapbox (rust-lang/cargo#14079)
- Use `std::fs::absolute` instead of reimplementing it (rust-lang/cargo#14075)
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r? ghost
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Rollup of 10 pull requests
Successful merges:
- #124135 (delegation: Implement glob delegation)
- #125078 (fix: break inside async closure has incorrect span for enclosing closure)
- #125293 (Place tail expression behind terminating scope)
- #126422 (Suggest using a standalone doctest for non-local impl defs)
- #126493 (safe transmute: support non-ZST, variantful, uninhabited enums)
- #126504 (Sync fuchsia test runner with clang test runner)
- #126558 (hir_typeck: be more conservative in making "note caller chooses ty param" note)
- #126586 (Add `@badboy` and `@BlackHoleFox` as Mac Catalyst maintainers)
- #126615 (Add `rustc-ice*` to `.gitignore`)
- #126632 (Replace `move||` with `move ||`)
r? `@ghost`
`@rustbot` modify labels: rollup
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Replace `move||` with `move ||`
Edit from #126631 to revert changes in `tests/ui`.
There are 18 instances of `move||` across 6 files in the repo:
- `compiler/rustc_hir_typeck/src/typeck_root_ctxt.rs`
- `library/core/src/sync/atomic.rs`
- `library/std/src/sync/condvar.rs`
- `library/std/src/sync/mpsc/mod.rs`
- `library/std/src/sync/barrier.rs`
- `library/std/src/thread/local.rs`
I have replaced all such instances with `move ||` instead as it better adheres to modern formatting standards.
Ideally, we would have this automated by rustfmt or some other tool, but I do not have the time to implement such a feature or tool.
Nonetheless, I would encourage any effort invested into such a tool or feature.
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Add `rustc-ice*` to `.gitignore`
I am a bit surprised this wasn't already here but there doesn't seem to be any reason not to add it. This will be nice to cut down on `git {add, diff, etc}` noise when debugging crashes.
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Add @badboy and @BlackHoleFox as Mac Catalyst maintainers
Assented in https://github.com/rust-lang/compiler-team/issues/761#issuecomment-2173071316 and https://rust-lang.zulipchat.com/#narrow/stream/233931-t-compiler.2Fmajor-changes/topic/Promote.20Mac.20Catalyst.20targets.20to.20Tier.202.20compiler-team.23761/near/444590303.
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hir_typeck: be more conservative in making "note caller chooses ty param" note
In https://github.com/rust-lang/rust/pull/122195 I added a "caller chooses ty for type param" note for when the return expression type a.k.a. found type does not match the expected return type.
#126547 found that this note was confusing when the found return type *contains* the expected type, e.g.
```rs
fn f<T>(t: &T) -> T {
t
}
```
because the found return type `&T` will *always* be different from the expected return type `T`, so the note was needlessly redundant and confusing.
This PR addresses that by not making the note if the found return type contains the expected return type.
r? ``@fmease`` (since you reviewed the original PR)
Fixes https://github.com/rust-lang/rust/issues/126547
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Sync fuchsia test runner with clang test runner
This synchronizes the fuchsia test running code with the clang test runner. This brings with it:
* Improved logging
* Uses the fuchsia image from the SDK version
* Caches the product bundle across test runs
* Strips the binaries to reduce the data sent to the emulator
r? ``@tmandry``
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safe transmute: support non-ZST, variantful, uninhabited enums
Previously, `Tree::from_enum`'s implementation branched into three disjoint cases:
1. enums that uninhabited
2. enums for which all but one variant is uninhabited
3. enums with multiple variants
This branching (incorrectly) did not differentiate between variantful and variantless uninhabited enums. In both cases, we assumed (and asserted) that uninhabited enums are zero-sized types. This assumption is false for enums like:
enum Uninhabited { A(!, u128) }
...which, currently, has the same size as `u128`. This faulty assumption manifested as the ICE reported in #126460.
In this PR, we revise the first case of `Tree::from_enum` to consider only the narrow category of "enums that are uninhabited ZSTs". These enums, whose layouts are described with `Variants::Single { index }`, are special in their layouts otherwise resemble the `!` type and cannot be descended into like typical enums. This first case captures uninhabited enums like:
enum Uninhabited { A(!, !), B(!) }
The second case is revised to consider the broader category of "enums that defer their layout to one of their variants"; i.e., enums whose layouts are described with `Variants::Single { index }` and that do have a variant at `index`. This second case captures uninhabited enums that are not ZSTs, like:
enum Uninhabited { A(!, u128) }
...which represent their variants with `Variants::Single`.
Finally, the third case is revised to cover the broader category of "enums with multiple variants", which captures uninhabited enums like:
enum Uninhabited { A(u8, !), B(!, u32) }
...which represent their variants with `Variants::Multiple`.
This PR also adds a comment requested by ````@RalfJung```` in his review of #126358 to `compiler/rustc_const_eval/src/interpret/discriminant.rs`.
Fixes #126460
r? ````@compiler-errors````
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Suggest using a standalone doctest for non-local impl defs
This PR tweaks the lint output of the `non_local_definitions` lint to suggest using a standalone doctest instead of a moving the `impl` def to an impossible place as was already done with `macro_rules!` case in https://github.com/rust-lang/rust/pull/124568.
Fixes #126339
r? ```@fmease```
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r=estebank,davidtwco
Place tail expression behind terminating scope
This PR implements #123739 so that we can do further experiments in nightly.
A little rewrite has been applied to `for await` lowering. It was previously `unsafe { Pin::unchecked_new(into_async_iter(..)) }`. Under the edition 2024 rule, however, `into_async_iter` gets dropped at the end of the `unsafe` block. This presumably the first Edition 2024 migration rule goes by hoisting `into_async_iter(..)` into `match` one level above, so it now looks like the following.
```rust
match into_async_iter($iter_expr) {
ref mut iter => match unsafe { Pin::unchecked_new(iter) } {
...
}
}
```
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fix: break inside async closure has incorrect span for enclosing closure
Fixes #124496
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delegation: Implement glob delegation
Support delegating to all trait methods in one go.
Overriding globs with explicit definitions is also supported.
The implementation is generally based on the design from https://github.com/rust-lang/rfcs/pull/3530#issuecomment-2020869823, but unlike with list delegation in https://github.com/rust-lang/rust/pull/123413 we cannot expand glob delegation eagerly.
We have to enqueue it into the queue of unexpanded macros (most other macros are processed this way too), and then a glob delegation waits in that queue until its trait path is resolved, and enough code expands to generate the identifier list produced from the glob.
Glob delegation is only allowed in impls, and can only point to traits.
Supporting it in other places gives very little practical benefit, but significantly raises the implementation complexity.
Part of https://github.com/rust-lang/rust/issues/118212.
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Rewrite `separate-link`, `separate-link-fail` and `allocator-shim-circular-deps` `run-make` tests to `ui` or `rmake`
Part of #121876 and the associated [Google Summer of Code project](https://blog.rust-lang.org/2024/05/01/gsoc-2024-selected-projects.html).
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- Avoid "caller chooses ty for type param" note if the found type a.k.a.
the return expression type *contains* the type parameter, because e.g.
`&T` will always be different from `T` (i.e. "well duh").
- Rename `note_caller_chooses_ty_for_ty_param` to
`try_note_caller_chooses_ty_for_ty_param` because the note is not
always made.
Issue: https://github.com/rust-lang/rust/issues/126547
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Uplift next trait solver to `rustc_next_trait_solver`
🎉
There's so many FIXMEs! Sorry! Ideally this merges with the FIXMEs and we track and squash them over the near future.
Also, this still doesn't build on anything other than rustc. I still need to fix `feature = "nightly"` in `rustc_type_ir`, and remove and fix all the nightly feature usage in the new trait solver (notably: let-chains).
Also, sorry `@lcnr` I know you asked for me to separate the commit where we `mv rustc_trait_selection/solve/... rustc_next_trait_solver/solve/...`, but I had already done all the work by that point. Luckily, `git` understands the file moves so it should still be relatively reviewable.
If this is still very difficult to review, then I can do some rebasing magic to try to separate this out. Please let me know!
r? lcnr
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Replace all `&DiagCtxt` with a `DiagCtxtHandle<'_>` wrapper type
r? `@davidtwco`
This paves the way for tracking more state (e.g. error tainting) in the diagnostic context handle
Basically I will add a field to the `DiagCtxtHandle` that refers back to the `InferCtxt`'s (and others) `Option<ErrorHandled>`, allowing us to immediately taint these contexts when emitting an error and not needing manual tainting anymore (which is easy to forget and we don't do in general anyway)
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This paves the way for tracking more state (e.g. error tainting) in the diagnostic context handle
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incompatible lifetimes
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Edit from #126631 to revert changes on ui tests
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Rollup of 5 pull requests
Successful merges:
- #125988 (Migrate `run-make/used` to `rmake.rs`)
- #126500 (Migrate `error-found-staticlib-instead-crate`, `output-filename-conflicts-with-directory`, `output-filename-overwrites-input`, `native-link-modifier-verbatim-rustc` and `native-link-verbatim-linker` `run-make` tests to `rmake.rs` format)
- #126583 (interpret: better error when we ran out of memory)
- #126587 (coverage: Add debugging flag `-Zcoverage-options=no-mir-spans`)
- #126621 (More thorough status-quo tests for `#[coverage(..)]`)
r? `@ghost`
`@rustbot` modify labels: rollup
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More thorough status-quo tests for `#[coverage(..)]`
In light of the stabilization push at https://github.com/rust-lang/rust/issues/84605#issuecomment-2166514660, I have written some tests to more thoroughly capture the current behaviour of the `#[coverage(..)]` attribute.
These tests aim to capture the *current* behaviour, which is not necessarily the desired behaviour. For example, some of the error message are not great, some things that perhaps ought to cause an error do not, and recursive coverage attributes have not been implemented yet.
`@rustbot` label +A-code-coverage
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coverage: Add debugging flag `-Zcoverage-options=no-mir-spans`
When set, this flag skips the code that normally extracts coverage spans from MIR statements and terminators. That sometimes makes it easier to debug branch coverage and MC/DC coverage instrumentation, because the coverage output is less noisy.
For internal debugging only. If future code changes would make it hard to keep supporting this flag, it should be removed at that time.
`@rustbot` label +A-code-coverage
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interpret: better error when we ran out of memory
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Migrate `error-found-staticlib-instead-crate`, `output-filename-conflicts-with-directory`, `output-filename-overwrites-input`, `native-link-modifier-verbatim-rustc` and `native-link-verbatim-linker` `run-make` tests to `rmake.rs` format
Part of #121876 and the associated [Google Summer of Code project](https://blog.rust-lang.org/2024/05/01/gsoc-2024-selected-projects.html).
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Migrate `run-make/used` to `rmake.rs`
Part of https://github.com/rust-lang/rust/issues/121876.
r? `@jieyouxu`
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Migrate `issue-64153`, `invalid-staticlib` and `no-builtins-lto` `run-make` tests to `rmake`
Part of #121876 and the associated [Google Summer of Code project](https://blog.rust-lang.org/2024/05/01/gsoc-2024-selected-projects.html).
try-job: x86_64-msvc
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These tests reflect the current implementation behaviour, which is not
necessarily the desired behaviour.
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This test reflects the current implementation behaviour, which is not
necessarily the desired behaviour.
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Rework `feature(precise_capturing)` to represent `use<...>` as a syntactical bound
Reworks `precise_capturing` for a recent lang-team consensus.
Specifically:
> The conclusion of the team is that we'll make use<..> a bound. That is, we'll support impl use<..> + Trait, impl Trait + use<..>, etc.
> For now, we will support at most one such bound in a list of bounds, and semantically we'll only support these bounds in the item bounds of RPIT-like impl Trait opaque types (i.e., in the places discussed in the RFC).
Lang decision in favor of this approach:
- https://github.com/rust-lang/rust/issues/125836#issuecomment-2151351849
Tracking:
- https://github.com/rust-lang/rust/issues/123432
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