Method as_mut_ptr

crates/core/src/alloc/vec.rs:334–336

Same as [`std::vec::Vec::as_mut_ptr`]. Note that this is technically inherited through the `DerefMut` impl but that converts `&mut Self` to `&mut [T]` which invalidates all previously derived pointers. This causes problems in Miri so by having an inherent method here it means that the borrow scope matches what we want with Miri.

(&mut self)

    // method here it means that the borrow scope matches what we want with
    // Miri.
    pub fn as_mut_ptr(&mut self) -> *mut T {
        self.inner.as_mut_ptr()
    }
}

impl<T> Deref for TryVec<T> {