?- time_out(true,3600,time_out).
yes
?- catch(time_out(throw(x),3600,R),x,length(L,L)).
ERROR!!
UNHANDLED EXCEPTION - message time_out unknown
?- time_out(true,3600,time_out).
yes
?- catch(time_out(throw(x),3600,R),x,length(L,L)).
ERROR!!
UNHANDLED EXCEPTION - message time_out unknown