"add", "info", "remove",
#ifndef TCL_REMOVE_OBSOLETE_TRACES
	"variable", "vdelete", "vinfo",
#endif
	NULL
    };
    /* 'OLD' options are pre-Tcl-8.4 style */
    enum traceOptionsEnum {
	TRACE_ADD, TRACE_INFO, TRACE_REMOVE,
#ifndef TCL_REMOVE_OBSOLETE_TRACES
	TRACE_OLD_VARIABLE, TRACE_OLD_VDELETE, TRACE_OLD_VINFO
#endif
    };

    if (objc < 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "option ?arg ...?");
	return TCL_ERROR;
    }

    if (Tcl_GetIndexFromObj(interp, objv[1], traceOptions, "option", 0,
	    &optionIndex) != TCL_OK) {
	return TCL_ERROR;
    }
    switch ((enum traceOptionsEnum) optionIndex) {
    case TRACE_ADD:
    case TRACE_REMOVE: {
	/*
	 * All sub commands of trace add/remove must take at least one more
	 * argument. Beyond that we let the subcommand itself control the
	 * argument structure.
	 */