Updated tracking issue number

Added safeguards for transmute_vec potentially being factored out elsewhere

Clarified comment about avoiding mem::forget

Removed unneeded unstable guard

Added back a stability annotation for CI

Minor documentation improvements

Thanks to @Centril's code review

Co-Authored-By: Mazdak Farrokhzad <twingoow@gmail.com>

Improved layout checks, type annotations and removed unaccurate comment

Removed unnecessary check on array layout

Adapt the stability annotation to the new 1.41 milestone

Co-Authored-By: Mazdak Farrokhzad <twingoow@gmail.com>

Simplify the implementation.

Use `Vec::into_raw_parts` instead of a manual implementation of
`Vec::transmute`.

If `Vec::into_raw_parts` uses `NonNull` instead, then the code here
will need to be adjusted to take it into account (issue rust-lang#65816)

Reduce the whitespace of safety comments

Previously `std::fs::copy` on wasm32-wasi would reuse code from the `sys_common` module and would successfully copy contents of the file just to fail right before closing it.

This was happening because `sys_common::copy` tries to copy permissions of the file, but permissions are not a thing in WASI (at least yet) and `set_permissions` is implemented as an unconditional runtime error.

This change instead adds a custom working implementation of `std::fs::copy` (like Rust already has on some other targets) that doesn't try to call `set_permissions` and is essentially a thin wrapper around `std::io::copy`.

Fixes rust-lang#68560.

Currently, we emit a "try adding a comma" suggestion if a comma is
missing in a struct definition. However, we emit no such suggestion if a
comma is missing in a struct initializer.

This commit adds a "try adding a comma" suggestion when we don't find a
comma during the parsing of a struct initializer field.

The change to `src/test/ui/parser/removed-syntax-with-1.stderr` isn't
great, but I don't see a good way of avoiding it.

…_from_vec_of_nonzerou8, r=KodrAus

Added From<Vec<NonZeroU8>> for CString

Added a `From<Vec<NonZeroU8>>` `impl` for `CString`

# Rationale

  - `CString::from_vec_unchecked` is a subtle function, that makes `unsafe` code harder to audit when the generated `Vec`'s creation is non-trivial. This `impl` allows to write safer `unsafe` code thanks to the very explicit semantics of the `Vec<NonZeroU8>` type.

  - One such situation is when trying to `.read()` a `CString`, see issue rust-lang#59229.

      - this lead to a PR: rust-lang#59314, that was closed for being too specific / narrow (it only targetted being able to `.read()` a `CString`, when this pattern could have been generalized).

     - the issue suggested another route, based on `From<Vec<NonZeroU8>>`, which is indeed a less general and more concise code pattern.

  - quoting @Shnatsel:

      - >  For me the main thing about making this safe is simplifying auditing - people have spent like an hour looking at just this one unsafe block in libflate because it's not clear what exactly is unchecked, so you have to look it up when auditing anyway. This has distracted us from much more serious memory safety issues the library had.
Having this trivial impl in stdlib would turn this into safe code with compiler more or less guaranteeing that it's fine, and save anyone auditing the code a whole lot of time.

implement LowerExp and UpperExp for integers

Addresses rust-lang#39479

This implementation is heavily based on the preexisting `macro_rules! impl_Display` in the same file. I don't like the liberal use of unsafe in that macro and would like to modify it so `unsafe` is only present where necessary. What is Rust's policy on doing such modifications?

Also, I couldn't figure out where to put tests, can I have some help with that?

Fix std::fs::copy on WASI target

Previously `std::fs::copy` on wasm32-wasi would reuse code from the `sys_common` module and would successfully copy contents of the file just to fail right before closing it.

This was happening because `sys_common::copy` tries to copy permissions of the file, but permissions are not a thing in WASI (at least yet) and `set_permissions` is implemented as an unconditional runtime error.

This change instead adds a custom working implementation of `std::fs::copy` (like Rust already has on some other targets) that doesn't try to call `set_permissions` and is essentially a thin wrapper around `std::io::copy`.

Fixes rust-lang#68560.

…enkov

Avoid calling `fn_sig` on closures

Fixes rust-lang#68060

r? @petrochenkov

…jasper

Check `has_typeck_tables` before calling `typeck_tables_of`

Fixes rust-lang#68684

r? @matthewjasper

…, r=petrochenkov

Suggest a comma if a struct initializer field fails to parse

Currently, we emit a "try adding a comma" suggestion if a comma is
missing in a struct definition. However, we emit no such suggestion if a
comma is missing in a struct initializer.

This commit adds a "try adding a comma" suggestion when we don't find a
comma during the parsing of a struct initializer field.

The change to `src/test/ui/parser/removed-syntax-with-1.stderr` isn't
great, but I don't see a good way of avoiding it.