Tracking issue for str::as_mut_ptr

[RalfJung]

This is a tracking issue for str::as_mut_ptr:

impl str {
    /// Converts a mutable string slice to a raw pointer.
    ///
    /// As string slices are a slice of bytes, the raw pointer points to a
    /// [`u8`]. This pointer will be pointing to the first byte of the string
    /// slice.
    ///
    /// It is your responsibility to make sure that the string slice only gets
    /// modified in a way that it remains valid UTF-8.
    ///
    /// [`u8`]: primitive.u8.html
    pub fn as_mut_ptr(&mut self) -> *mut u8;
}

Implemented in #58200

[SimonSapin]

Given that the implementation is trivial I don’t think letting it "bake" in Nightly is any use. And since [T] already has this method and str already has the *const version of this, I don’t expect this to be controversial at all. Still, let’s go through the usual dance:

@rfcbot fcp merge

[rfcbot]

Team member @SimonSapin has proposed to merge this. The next step is review by the rest of the tagged team members:

• @Kimundi
• @SimonSapin
• @alexcrichton
• @dtolnay
• @sfackler
• @withoutboats

No concerns currently listed.

Once a majority of reviewers approve (and none object), this will enter its final comment period. If you spot a major issue that hasn't been raised at any point in this process, please speak up!

See this document for info about what commands tagged team members can give me.

[rfcbot]

🔔 This is now entering its final comment period, as per the review above. 🔔

[rfcbot]

The final comment period, with a disposition to merge, as per the review above, is now complete.