@verb #9253:":add_vertex" this none this rxdo #7165
@program #9253:":add_vertex" this none this
set_task_perms(caller_perms())
{v} = args
v in this.vertices && raise(E_INVARG)
this.vertices = {@this.vertices, v}
"Last modified by manta (#7165) on Thu Nov  1 13:41:10 2001 MST."
.