free c_secret:bitstring [private].
free c:channel.
event Toto(bitstring).
free a:bitstring.

query x:bitstring, y:bitstring; attacker(c_secret) ==> (event(Toto(x)) && event(Toto(y)) && x <> y).

process
  in(c,x:bitstring);
  event Toto(x);
  event Toto(a);
  out(c,c_secret)

(* EXPECTPV
RESULT attacker(c_secret[]) ==> event(Toto(x_1)) && event(Toto(y)) && x_1 ≠ y is false.
0.004s (user 0.000s + system 0.004s), max rss 7260K
END *)
