Adjust Miri value visitor, and doc-comment layout components
I realized that I still didn't have quite the right intuition for how our `LayoutDetails` work, so I had to adjust the Miri value visitor to the things I understood better now. I also added some doc-comments to `LayoutDetails` as a hopefully canonical place to note such things.
The main visitor change is that we *first* look at all the fields (according to `FieldPlacement`), and *then* check the variants and handle `Multiple` appropriately. I did not quite realize how orthogonal "fields" and "variants" are.
I also moved the check for the scalar ABI to *after* checking all the fields; this leads to better (more type-driven) error messages.
And it looks like we can finally remove that magic hack for `ty::Generator`. :D
r? @oli-obk for the Miri/visitor changes and @eddyb for the layout docs
The Miri PR is at: https://github.com/rust-lang/miri/pull/1178
* Add a new method `has_infer_types_or_consts` that's used instead most
of the time, since there's generally no reason to only consider types.
* Remove use of `has_closure_types`, because closures are no longer
implicitly linked to the `InferCtxt`.
When the obligation that couldn't be fulfilled is specific to a nested
obligation, maintain both the nested and parent obligations around for
more accurate and detailed error reporting.
Surface associated type projection bounds that could not be fulfilled in
E0599 errors. Always present the list of unfulfilled trait bounds,
regardless of whether we're pointing at the ADT or trait that didn't
satisfy it.
parser: `token` -> `normalized_token`, `nonnormalized_token` -> `token`
So, after https://github.com/rust-lang/rust/pull/69006, its follow-ups and an attempt to remove `Parser::prev_span` I came to the conclusion that the unnormalized token and its span is what you want in most cases, so it should be default.
Normalization only makes difference in few cases where we are checking against `token::Ident` or `token::Lifetime` specifically.
This PR uses `normalized_token` for those cases.
Using normalization explicitly means that people writing code should remember about `NtIdent` and `NtLifetime` in general. (That is alleviated by the fact that `token.ident()` and `fn parse_ident_*` are already written.)
Remembering about `NtIdent`, was, however, already the case, kind of, because the implicit normalization was performed only for the current/previous token, but not for things like `look_ahead`.
As a result, most of token classification methods in `token.rs` already take `NtIdent` into account (this PR fixes a few pre-existing minor mistakes though).
The next step is removing `normalized(_prev)_token` entirely and replacing it with `token.ident()` (mostly) and `token.normalize()` (occasionally).
I want to make it a separate PR for that and run it though perf.
`normalized_token` filled on every bump has both a potential to avoid repeated normalization, and to do unnecessary work in advance (it probably doesn't matter anyway, the normalization is very cheap).
r? @Centril
instantiate_value_path: on `SelfCtor`, avoid unconstrained tyvars
Fixes https://github.com/rust-lang/rust/issues/69306.
On `Self(...)` (that is, a `Res::SelfCtor`), do not use `self.impl_self_ty(...)`. The problem with that method is that it creates unconstrained inference variables for type parameters in the `impl` (e.g. `impl<T> S0<T>`). These variables then eventually get substituted for something else when they come in contact with the expected type (e.g. `S0<u8>`) or merely the arguments passed to the tuple constructor (e.g. the `0` in `Self(0)`).
Instead of using `self.impl_self_ty(...)`, we instead merely use `let ty = self.normalize_ty(span, tcx.at(span).type_of(impl_def_id));` to get the rewritten `res`.
r? @eddyb
Account for bounds and asociated items when denying `_`
Fix#68801, #69204. Follow up to #67597 and #68071.
Output for the original ICE report:
```
Checking vinoteca v5.0.0 (/Users/ekuber/workspace/vinoteca)
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> src/producers.rs:43:70
|
43 | pub fn top<Table: diesel::Table + diesel::query_dsl::InternalJoinDsl<_, diesel::query_source::joins::Inner, _>>(table: Table, limit: usize, connection: DbConn) -> RestResult<Vec<TopWineType>> {
| ^ not allowed in type signatures ^ not allowed in type signatures
error: aborting due to previous error
```
Canonicalize inputs to const eval where needed
Canonicalize inputs to const eval, so that they can contain inference variables. Which enables invoking const eval queries even if the current param env has inference variable within it, which can occur during trait selection.
This is a reattempt of #67717, in a far less invasive way.
Fixes#68477
r? @nikomatsakis
cc @eddyb
Rollup of 9 pull requests
Successful merges:
- #69379 (Fail on multiple declarations of `main`.)
- #69430 (librustc_typeck: remove loop that never actually loops)
- #69449 (Do not ping PR reviewers in toolstate breakage)
- #69491 (rustc_span: Add `Symbol::to_ident_string` for use in diagnostic messages)
- #69495 (don't take redundant references to operands)
- #69496 (use find(x) instead of filter(x).next())
- #69501 (note that find(f) is equivalent to filter(f).next() in the docs.)
- #69527 (Ignore untracked paths when running `rustfmt` on repository.)
- #69529 (don't use .into() to convert types into identical types.)
Failed merges:
r? @ghost
Fail on multiple declarations of `main`.
Closes#67946.
Previously, when inserting the entry function, we only checked for
duplicate _definitions_ of `main`. However, it's possible to cause
problems even only having a duplicate _declaration_. For example,
shadowing `main` using an extern block isn't caught by the current
check, and causes an assertion failure down the line in in LLVM code.
r? @pnkfelix
Revert "Mark attributes consumed by `check_mod_attrs` as normal"
This reverts commit d78b22f35e.
Those changes were incompatible with incremental compilation since the
effect `check_mod_attrs` has with respect to marking the attributes as
used is neither persisted nor recomputed.
