Add ARGC_OPT enum to provide more context for upcoming sample parse errors
involving proxy "option" config directives.
ARGC_USRV, /* use-server message */
ARGC_HERR, /* http-error */
ARGC_OT, /* opentracing scope args */
+ ARGC_OPT, /* option directive */
ARGC_TCO, /* tcp-request connection expression */
ARGC_TSE, /* tcp-request session expression */
ARGC_TRQ, /* tcp-request content expression */
case ARGC_USRV: where = "in use-server or balance expression in"; break;
case ARGC_HERR: where = "in http-error directive in"; break;
case ARGC_OT: where = "in ot-scope directive in"; break;
+ case ARGC_OPT: where = "in option directive in"; break;
case ARGC_TCO: where = "in tcp-request connection expression in"; break;
case ARGC_TSE: where = "in tcp-request session expression in"; break;
case ARGC_TRQ: where = "in tcp-request content expression in"; break;