free c:channel.

free a:bitstring [private].
free b:bitstring [private].

query x:bitstring, y:bitstring; attacker((x,y)) ==> attacker(x) && attacker(y).

process
  out(c,(a,b))

(* EXPECTPV
RESULT attacker((x,y)) ==> attacker(x) && attacker(y) is true.
0.008s (user 0.000s + system 0.008s), max rss 7156K
END *)
