
fun enc(bitstring,bitstring):bitstring.
fun dec(bitstring,bitstring):bitstring.

equation forall x:bitstring,k:bitstring; dec(enc(x,k),k) = x [linear].
equation forall x:bitstring,k:bitstring; enc(dec(x,k),k) = k [convergent].

process 0

(* EXPECTPV
Error: the following sets of equations
Error: Blocks of equations marked [convergent] or [linear] should use function symbols disjoint from each other.
xtime: error in child process (status : 2)
END *)
