Hi,
The program http://rise4fun.com/Dafny/o2Po
defines a function that returns a set of sequences and a method that computes this function
as ensured in its postcondition.
The program is only verified in the online version of Dafny, but not in MVS.
We have then turned the function into function method to check its behaviour
and we found a divergence in the results (see the method Main).
Thanks in advance,
Paqui