resolve: skip underscore character during candidate lookup
Fixes#116164
In use statement, an underscore is merely a placeholder symbol and does not bind to any name. Therefore, it can be safely ignored.
More accurate suggestion for `self.` and `Self::`
Detect that we can't suggest `self.` in an associated function without `&self` receiver.
Partially address #115992.
r? ``@compiler-errors``
This function is now used to check `#[panic_handler]`, `start` lang item, `main`, `#[start]` and intrinsic functions.
The diagnosis produced are now closer to the ones produced by trait/impl method signature mismatch.
Improve diagnostic for generic params from outer items (E0401)
Generalize the wording of E0401 to talk about *outer items* instead of *outer functions* since the current phrasing is outdated. The outer item can be a function, constant, trait, ADT or impl block (see the new UI test for the more exotic examples).
Further, don't suggest introducing generic parameters to constant items unless the feature `generic_const_items` is enabled.
Lastly, make E0401 translatable while we're at it.
Fixes#115720.
Add filter with following segment while lookup typo for path
From the discussion: https://github.com/rust-lang/rust/pull/112917#discussion_r1239150173
Seems we can not get the assoc items for `Struct`, `Enum` in the resolving phase.
A obvious filter is avoid suggesting the same name with the following segment path.
Use `following_seg` can extend the function `smart_resolve_partial_mod_path_errors` for more scenarios, such as `std::sync_error::atomic::AtomicBool` in test case.
r? `@estebank`
Suggest publicly accessible paths for items in private mod:
When encountering a path in non-import situations that are not reachable
due to privacy constraints, search for any public re-exports that the
user could use instead.
Track whether an import suggestion is offering a re-export.
When encountering a path with private segments, mention if the item at
the final path segment is not publicly accessible at all.
Add item visibility metadata to privacy errors from imports:
On unreachable imports, record the item that was being imported in order
to suggest publicly available re-exports or to be explicit that the item
is not available publicly from any path.
In order to allow this, we add a mode to `resolve_path` that will not
add new privacy errors, nor return early if it encounters one. This way
we can get the `Res` corresponding to the final item in the import,
which is used in the privacy error machinery.
fix(resolve): update shadowed_glob more precision
- Fixes#109153
- Fixes#109962
## Why does it panic?
We use #109153 as an illustration.
The process of `resolve_imports` is:
| Iter | resolve | resolution of **`(Mod(root), Ident(bar) in type ns)`** |
| - | - | - |
| 0 | `use foo::*` | `binding` -> foo::bar, `shallowed_glob` -> `None` |
| 1 | `use bar::bar` | `binding` -> foo::bar::bar, `shallowed_glob` -> foo::bar |
| 2 | `use bar::*` | `binding` -> foo::bar::bar, `shallowed_glob` -> foo::bar::bar::bar |
So during `finalize_import`, the `root::bar` in `use bar::bar` had been pointed to `foo::bar::bar::bar`, which is different from the `initial_module` valued of `foo::bar`, therefore, the panic had been triggered.
## Try to solve it
~I think #109153 should check-pass rather than throw an ambiguous error. Following this idea, there are two ways to solve this problem:~
~1. Give up the `initial_module` and update `import.imported_module` after each resolution update. However, I think this method may have too much impact.~
~2. Do not update the `shadowed_glob` when it is defined.~
~To be honest, I am not sure if this is the right way to solve this ICE. Perhaps there is a better resolution.~
Edit: we had made the `resolution.shadowed_glob` update more detailed.
r? `@petrochenkov`
- Either explicitly annotate `let x: () = expr;` where `x` has unit
type, or remove the unit binding to leave only `expr;` instead.
- Fix disjoint-capture-in-same-closure test
Suppress "erroneous constant used" for constants tainted by errors
When constant evaluation fails because its MIR is tainted by errors,
suppress note indicating that erroneous constant was used, since those
errors have to be fixed regardless of the constant being used or not.
Fixes#110891.
