TypeAntecedents.dfy(35,12): Error: assertion might not hold
TypeAntecedents.dfy(58,0): Error: a postcondition could not be proved on this return path
TypeAntecedents.dfy(57,14): Related location: this is the postcondition that could not be proved
TypeAntecedents.dfy(66,15): Error: assertion might not hold

Dafny program verifier finished with 5 verified, 3 errors
