for(var/mob/A in world)
    if(A.z==usr.z)
        A.verbs-=typesof(/mob/sim/verb)

for(var/mob/A in world)
    if(A.z==usr.z)
        A.verbs+=typesof(/mob/sim/verb)

loading project.dme
SimOwner.dm:41:error:/mob/sim/verb: compile failed (possible infinite cross-reference loop)
SimOwner.dm:44:error:/mob/sim/verb: compile failed (possible infinite cross-reference loop)

project.dmb - 2 errors, 0 warnings (double-click on an error to jump to it)