Fix ICE in `named_arguments_used_positionally` lint
Fixes#99261Fixes#99289Fixes#99284Fixes#99273Fixes#99297Fixes#99271
This match pattern:
```
FormatSpec { width: Count::CountIsName(s, _), .. }
| FormatSpec { precision: Count::CountIsName(s, _), .. }
```
does not account for when both `width` and `precision` are both `Count::CountIsName`, so split the check for these two fields into two separate `if let`.
Also, remove any future potential for ICEs by removing the index operator altogether.
---
It is still suspicious that this indexing was broken and caused the ICE, as opposed to just causing a spurious lint message.
cc `@PrestonFrom,` who may be familiar with this code because of implementing the lint this touches, perhaps you'd like to look into why named arguments in `FormatSpec.precision` seem to have indices that don't correspond to a span in `Context.arg_spans`?
Edit: Opened #99265 to track a (related?) incorrect argument indexing issue.
Add Output = expected type trait obligation for known binary operators
This PR is a follow-on to #94034 that addresses #96442. That is, after replacing the trait-suggestion logic in `op.rs` with a more generic path that analyzes a general set of `Obligation`s, then we lost some specificity in the suggestions where the bounds on the associated type `Output=` would not get suggested.
This PR fixes this issue by changing `FnCtxt::construct_obligation_for_trait` to include a new `ProjectionPredicate` obligation for binary operators that obliges that `Output` is the same as the expected type of the expression. Additionally, to get the expected type of the expression, this PR threads the `Expectation<'tcx>` structure throughout several functions.
See src/test/ui/generic-associated-types/missing-bounds.stderr for an example of how this works.
One side effect of this change is it causes type-check failures with binops to include additional information. Specifically, many now say
```
error: type mismatch resolving `<Lhs as TheBinop>::Output == ExpectedTy`
```
It's up for discussion whether this added context is worth it to the user.
r? `@estebank`
Stabilize `core::ffi::CStr`, `alloc::ffi::CString`, and friends
Stabilize the `core_c_str` and `alloc_c_string` feature gates.
Change `std::ffi` to re-export these types rather than creating type
aliases, since they now have matching stability.
Revert "Work around invalid DWARF bugs for fat LTO"
Since September, the toolchain has not been generating reliable DWARF
information for static variables when LTO is on. This has affected
projects in the embedded space where the use of LTO is typical. In our
case, it has kept us from bumping past the 2021-09-22 nightly toolchain
lest our debugger break. This has been a pretty dramatic regression for
people using debuggers and static variables. See #90357 for more info
and a repro case.
This commit is a mechanical revert of
d5de680e20 from PR #89041, which caused
the issue. (Note on that PR that the commit's author has requested it be
reverted.)
I have locally verified that this fixes#90357 by restoring the
functionality of both the repro case I posted on that bug, and debugger
behavior on real programs. There do not appear to be test cases for this
in the toolchain; if I've missed them, point me at 'em and I'll update
them.
Mark stabilized intrinsics with `rustc_allowed_through_unstable_modules`
Fixes#99286
PR #95956 accidentally made these intrinsics unstable when
accessed through the unstable path segment 'std::intrinsics'
stop using `FnCtxt` outside of hir typeck
the requirements between **hir typeck**™, and **not hir typeck**™ are different enough to warrant a full split. with this PR `FnCtxt` is now only used for hir typeck (and for one clippy lint which seems to be emulating hir typeck).
Once this PR has landed I intend to move `FnCtxt` into a new crate. This should also allow some further general improvements here.
r? rust-lang/types
Final derive output improvements
With all these changes, the derive output in `deriving-all-codegen.stdout` is pretty close to optimal, i.e. very similar to what you'd write by hand.
r? `@ghost`
Correctly handle crate level page on docs.rs as well
Fixes#99121.
On docs.rs, they move the `class` attribute into a child which still has `rustdoc`. So instead of using the `<body>`, we can simply use this one directly.
r? `@jsha`
Remove some usages of `guess_head_span`
No need to pass things through `guess_head_span` if they already point to the head span.
Only major change is that we point to the head span of `enum`s on some errors now, which I prefer.
r? `@cjgillot`
Add Nintendo Switch as tier 3 target
[Relevant Zulip Discussion](https://rust-lang.zulipchat.com/#narrow/stream/219381-t-libs/topic/Upstreaming.20Nintendo.20Switch.20Support/near/253445503)
This is the first step towards working on incrementally adding support for the Nintendo Switch. After this lands `@leo60228` and I will work on ensuring further work is cleared from a legal perspective before continuing on to work on an allocator and porting libstd.
The plan is to keep these changes small and incremental enough so as to not cause unneeded burden on reviewers by submitting a single large patch, as was felt to be the case last attempt at upstreaming (#74567).
All this specific patch does is add the target itself without and std support, which has been tested on-device and is working as expected.
Designated Target Maintainers:
* `@leo60228`
* `@jam1garner`
Stabilize the `core_c_str` and `alloc_c_string` feature gates.
Change `std::ffi` to re-export these types rather than creating type
aliases, since they now have matching stability.
interpret: get rid of MemPlaceMeta::Poison
This is achieved by refactoring the projection code (`{mplace,place,operand}_{downcast,field,index,...}`) so that we no longer need to call `assert_mem_place` in the operand handling.
Rollup of 6 pull requests
Successful merges:
- #99113 (Simplify [a]rc code a little)
- #99131 (Add label for generic arg (+ APIT) and RPIT callables in `label_fn_like`)
- #99237 (removed unused CSS and unused HTML IDs)
- #99239 (Add myself to the set of people notified when MIR changes.)
- #99241 (Remove comment referring to constness.rs)
- #99257 (Add regression test for #89436)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Add regression test for #89436
I never got around to adding such a test.
In general I think the `yoke` crate has a bunch of interesting testcases that exercise various edges of the algorithms here, it would be nice if we could simply depend on the crate and add some tests that exercise it, but I don't think that's possible. Do you or `@eddyb` think there's any use trying to upstream a bunch of common yoke minimal working example code to the testsuite and having a ton of yoke tests?
Remove comment referring to constness.rs
This commit removes the comment in emulate_intrinsic, which is
currently referring to `src/librustc_middle/ty/constness.rs`.
