Function slice_unchecked

crates/wtf8/src/lib.rs:1333–1340

(s: &Wtf8, begin: usize, end: usize)

/// `begin` and `end` must be within bounds and on codepoint boundaries.
#[inline]
pub const unsafe fn slice_unchecked(s: &Wtf8, begin: usize, end: usize) -> &Wtf8 {
    // SAFETY: memory layout of a &[u8] and &Wtf8 are the same
    unsafe {
        let len = end - begin;
        let start = s.as_bytes().as_ptr().add(begin);
        Wtf8::from_bytes_unchecked(slice::from_raw_parts(start, len))
    }
}

/// Copied from core::str::raw::slice_error_fail
#[inline(never)]