Processing command (at Snapshots6.v0.dfy(20,14)) assert false;
  >>> DoNothingToAssert

Dafny program verifier finished with 4 verified, 0 errors
Processing command (at Snapshots6.v1.dfy(20,14)) assert false;
  >>> DoNothingToAssert
Snapshots6.v1.dfy(20,13): Error: assertion violation
Execution trace:
    (0,0): anon0

Dafny program verifier finished with 3 verified, 1 error