The code is dead because `check_pat_slice` will never have
`expected = ty::Ref(...)` due to default-binding-modes
(see `is_non_ref_pat`, `peel_off_references`).

Moreover, if the type is not `ty::Array(_) | ty::Slice(_)`
then `check_pat_slice` enters an error branch.

Also use `types.err` when matching on `expected.kind`s
which don't match `ty::Array(..) | ty::Slice(_)`.

Avoid calling `.node_type(...)` again.

After rust-lang#62550, it is no longer possible for `slice`
to be other than `None | Some(Binding(..) | Wild)`.
In particular, `lower_pat_slice` may never generate
`Some(Array(..) | Slice(..))` and so there is nothing
to flatten into `slice`.

(The backticks were rendering badly in VSCode.)

 Refactor type & bounds parsing thoroughly

PR is based on rust-lang#67131 with first one from this PR being ` extract parse_ty_tuple_or_parens`.

Also fixes rust-lang#67146.

r? @estebank

…lacrum

Reenable static linking of libstdc++ on windows-gnu

Fixes rust-lang#67408

Verified locally that `rustc_driver` is now statically linked to libstdc++.

…jasper

Cleanup `lower_pattern_unadjusted` & Improve slice pat typeck

Following up on rust-lang#67318, in this PR, the HAIR lowering of patterns (`lower_pattern_unadjusted`) is cleaned up with a focus on slice patterns (in particular, some dead code is removed). Moreover, `check_pat_slice` is refactored some more.

r? @matthewjasper

…-0-part-2, r=Centril

Require issue = "none" over issue = "0" in unstable attributes

These changes make the use of `issue = "none"` required in unstable attributes throughout the compiler.

Notes:
- rust-lang#66299 is now in beta so `issue = "none"` is accepted.
- The `tidy` tool now fails on `issue = "0"`.
- Tests that used `issue = "0"` were changed to use `issue = "none"`, except for _one_ that asserts `issue = "0"` can still be used.
- The compiler still allows `issue = "0"` because some submodules require it, this could be disallowed once these are updated.

Resolves rust-lang#41260

r? @varkor

…rns, r=Centril

Tweak non_shorthand_field_patterns' suggestion

Fixes rust-lang#66434

r? @estebank

…=Centril

Warn against relying on ?Sized being last

Fixes rust-lang#62522