Method insert_wtf8

crates/wtf8/src/lib.rs:516–520

(&mut self, idx: usize, w: &Wtf8)

    /// Inserts a WTF-8 slice into this `Wtf8Buf` at a byte position.
    #[inline]
    pub fn insert_wtf8(&mut self, idx: usize, w: &Wtf8) {
        assert!(is_code_point_boundary(self, idx));

        self.bytes.insert_str(idx, w)
    }

    /// Consumes the WTF-8 string and tries to convert it to a vec of bytes.
    #[inline]