Suggest trait bound on type parameter when it is unconstrained
Given
```
trait Foo { fn method(&self) {} }
fn call_method<T>(x: &T) {
x.method()
}
```
suggest constraining `T` with `Foo`.
Fix#21673, fix#41030.
Remove uses of mem::uninitialized from std::sys::cloudabi
Addresses #62397 for std::sys::cloudabi, excluding the tests within cloudabi, which will be a separate PR
Rollup of 14 pull requests
Successful merges:
- #60951 (more specific errors in src/librustc/mir/interpret/error.rs)
- #62523 (Delay bug to resolve HRTB ICE)
- #62656 (explain how to search in slice without owned data)
- #62791 (Handle more cases of typos misinterpreted as type ascription)
- #62804 (rustc_typeck: improve diagnostics for _ const/static declarations)
- #62808 (Revert "Disable stack probing for gnux32.")
- #62817 (Tweak span for variant not found error)
- #62842 (Add tests for issue-58887)
- #62851 (move unescape module to rustc_lexer)
- #62859 (Place::as_place_ref is now Place::as_ref)
- #62869 (add rustc_private as a proper language feature gate)
- #62880 (normalize use of backticks in compiler messages for librustc_allocator)
- #62885 (Change "OSX" to "macOS")
- #62889 (Update stage0.txt)
Failed merges:
r? @ghost
add rustc_private as a proper language feature gate
At the moment, `rustc_private` as a (library) feature exists by
accident: `char::is_xid_start`, `char::is_xid_continue` methods in
libcore define it.
cc https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/How.20to.20declare.20new.20langauge.20feature.3F
I don't know if this is at all reasonable, but at least tests seem to pass locally. That probably means that we can remove/rename to something more resonable the feature in libcore in the next release?
move unescape module to rustc_lexer
It makes sense to keep the definition of escape sequences closer to the lexer itself, and it is also a bit of code that I would like to share with rust-analyzer.
r? @petrochenkov
rustc_typeck: improve diagnostics for _ const/static declarations
This continues https://github.com/rust-lang/rust/pull/62694 and adds type suggestions to const/static declarations with `_` type.
r? @eddyb
Use sharded maps for interning
Cuts down runtime from 5.5s to 3.8s for non-incremental `syntex_syntax` check builds with 16 threads / 8 cores.
r? @eddyb
Fix typo in Unicode character name
There's a small typo in the Unicode character definitions: "Latin Epigraphic Letter Dideways" should be "Latin Epigraphic Letter Sideways I" (see [here](https://www.compart.com/en/unicode/U+A7F7)).
use const array repeat expressions for uninit_array
With a first implementation of https://github.com/rust-lang/rust/issues/49147 having landed, we can make this macro nicer and phase it out with the next bootstrap bump.
However, to make this work, we have to mark `MaybeUninit::uninit()` as promotable. I do feel uneasy about promoting stuff involving uninitialized memory, but OTOH no *operation* on `MaybeUninit` is promotable, so maybe this is okay?
r? @oli-obk @eddyb
