/// assert_eq!("🍔∈🌏", s);

/// ```

#[stable(feature = "str_mut_extras", since = "1.20.0")]

#[rustc_const_unstable(feature = "const_str_as_mut", issue = "130086")]

#[must_use]

#[inline(always)]

pub unsafe fn as_bytes_mut(&mut self) -> &mut [u8] {

pub const unsafe fn as_bytes_mut(&mut self) -> &mut [u8] {

// SAFETY: the cast from `&str` to `&[u8]` is safe since `str`

// has the same layout as `&[u8]` (only std can make this guarantee).

// The pointer dereference is safe since it comes from a mutable reference which

/// It is your responsibility to make sure that the string slice only gets

/// modified in a way that it remains valid UTF-8.

#[stable(feature = "str_as_mut_ptr", since = "1.36.0")]

#[rustc_const_unstable(feature = "const_str_as_mut", issue = "130086")]

#[rustc_never_returns_null_ptr]

#[must_use]

#[inline(always)]

pub fn as_mut_ptr(&mut self) -> *mut u8 {

pub const fn as_mut_ptr(&mut self) -> *mut u8 {

self as *mut str as *mut u8

}