``pair_tag_highlighter.c:156:9: warning: passing argument 4 of `findBracket' makes integer from pointer without a cast [enabled by default]``
``pair_tag_highlighter.c:44:13: note: expected `gchar' but argument is of type `void *'``
``NULL`` isn't a valid value for a ``gchar``: ``gchar`` is a byte, isn't not ``gchar*`` (pointer to byte(s)).  You probably want ``0`` (or ``'\0'``)