next

    pub fn next(iter: *InlineeSourceLocationIterator) ?*align(1) const pdb.InlineeSourceLine {
        if (iter.lines.len == 0) return null;
        const line = iter.lines[0];
        iter.lines = iter.lines[1..];
        // Filter out duplicate entries
        while (iter.lines.len != 0 and
            iter.lines[0].file_id == line.file_id and
            iter.lines[0].source_line_num == line.source_line_num)
        {
            iter.lines = iter.lines[1..];
        }
        return line;
    }