Port the "the type parameter `T` must be explicitly specified"
diagnostic to using a diagnostic struct.
Signed-off-by: David Wood <david.wood@huawei.com>
Using new support for spanless subdiagnostics from `()` fields in the
diagnostic derive, simplify the "explicit generic args with impl trait"
diagnostic's struct.
Signed-off-by: David Wood <david.wood@huawei.com>
Like we have `add`/`sub` which are the `usize` version of `offset`, this adds the `usize` equivalent of `offset_from`. Like how `.add(d)` replaced a whole bunch of `.offset(d as isize)`, you can see from the changes here that it's fairly common that code actually knows the order between the pointers and *wants* a `usize`, not an `isize`.
As a bonus, this can do `sub nuw`+`udiv exact`, rather than `sub`+`sdiv exact`, which can be optimized slightly better because it doesn't have to worry about negatives. That's why the slice iterators weren't using `offset_from`, though I haven't updated that code in this PR because slices are so perf-critical that I'll do it as its own change.
This is an intrinsic, like `offset_from`, so that it can eventually be allowed in CTFE. It also allows checking the extra safety condition -- see the test confirming that CTFE catches it if you pass the pointers in the wrong order.
Handle mismatched generic param kinds in trait impls betterly
- Check that generic params on a generic associated type are the same as in the trait definition
- Check that const generics are not used in place of type generics (and the other way round too)
r? `@lcnr`
Properly fix#96638Closes#96638
The main part of this change is `Error::Invalid` now returns both the input and arg indices. However, I realized the code here was kind of confusing and not internally consistent (and thus I was having trouble getting the right behavior). So I've also switched `input_indices` and `arg_indices` to more closely match some naming in `checks` (although I think a more thorough cleanup there could be beneficial). I've added comments, but essentially `input_indices` refers to *user provided* inputs and `arg_indices` refers to *expected* args.
Fortify handing of where bounds on trait & trait alias definitions
Closes https://github.com/rust-lang/rust/issues/96664
Closes https://github.com/rust-lang/rust/issues/96665
Since https://github.com/rust-lang/rust/pull/93803, when listing all bounds and predicates we now need to account for the possible presence of predicates on any of the generic parameters. Both bugs were hidden by the special handling of bounds at the generic parameter declaration position.
Trait alias expansion used to confuse predicates on `Self` and where predicates.
Exiting too late when listing all the bounds caused a cycle error.
Some subst cleanup
Two separate things here. Both changes are useful for some refactoring I'm doing to add an "EarlyBinder" newtype. (Part of chalkification).
1) Remove `subst_spanned` and just use `subst`. It wasn't used much anyways. In practice, I think we can probably get most of the info just from the actual error message. If not, outputting logs should do the trick. (The specific line probably wouldn't help much anyways).
2) Call `.subst()` before `replace_bound_vars_with_fresh_vars` and `erase_late_bound_regions` in three places that do the opposite. I think there might have been some time in the past that the order here matter for something, but this shouldn't be the case anymore. Conceptually, it makes more sense to the of the *early bound* vars on `fn`s as "outside" the late bound vars.
diagnostics: port more diagnostics to derive + add support for `Vec` fields
- Port "unconstrained opaque type" diagnostic to using the derive.
- Allow `Vec` fields in diagnostic derive - enables support for diagnostics that have multiple primary spans, or have subdiagnostics repeated at multiple locations. `Vec<..>` fields in the diagnostic derive become loops in the generated code.
- Add `create_{err,warning}` - there wasn't a way to create a diagnostic from a struct and not emit it straight away.
- Port "explicit generic args w/ impl trait" diagnostic to using the derive.
r? `````@oli-obk`````
cc `````@pvdrz`````
Begin fixing all the broken doctests in `compiler/`
Begins to fix#95994.
All of them pass now but 24 of them I've marked with `ignore HELP (<explanation>)` (asking for help) as I'm unsure how to get them to work / if we should leave them as they are.
There are also a few that I marked `ignore` that could maybe be made to work but seem less important.
Each `ignore` has a rough "reason" for ignoring after it parentheses, with
- `(pseudo-rust)` meaning "mostly rust-like but contains foreign syntax"
- `(illustrative)` a somewhat catchall for either a fragment of rust that doesn't stand on its own (like a lone type), or abbreviated rust with ellipses and undeclared types that would get too cluttered if made compile-worthy.
- `(not-rust)` stuff that isn't rust but benefits from the syntax highlighting, like MIR.
- `(internal)` uses `rustc_*` code which would be difficult to make work with the testing setup.
Those reason notes are a bit inconsistently applied and messy though. If that's important I can go through them again and try a more principled approach. When I run `rg '```ignore \(' .` on the repo, there look to be lots of different conventions other people have used for this sort of thing. I could try unifying them all if that would be helpful.
I'm not sure if there was a better existing way to do this but I wrote my own script to help me run all the doctests and wade through the output. If that would be useful to anyone else, I put it here: https://github.com/Elliot-Roberts/rust_doctest_fixing_tool
Rollup of 8 pull requests
Successful merges:
- #96660 ([bootstrap] Give a better error when trying to run a path with no registered step)
- #96701 (update `jemallocator` example to use 2018 edition import syntax)
- #96746 (Fix an ICE on #96738)
- #96758 (bootstrap: bsd platform flags for split debuginfo)
- #96778 (Remove closures on `expect_local` to apply `#[track_caller]`)
- #96781 (Fix an incorrect link in The Unstable Book)
- #96783 (Link to correct issue in issue-95034 known-bug)
- #96801 (Add regression test for #96319)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Put the incompatible_closure_captures lint messages in alphabetical order
Looks like they were in hash order before, which was causing me trouble in #94598, so this PR sorts the errors by trait name.
