OpaqueFunctions.dfy(16,17): Error: a postcondition could not be proved on this return path
OpaqueFunctions.dfy(17,14): Related location: this is the postcondition that could not be proved
OpaqueFunctions.dfy(58,2): Error: a postcondition could not be proved on this return path
OpaqueFunctions.dfy(57,16): Related location: this is the postcondition that could not be proved
OpaqueFunctions.dfy(65,2): Error: a postcondition could not be proved on this return path
OpaqueFunctions.dfy(64,16): Related location: this is the postcondition that could not be proved

Dafny program verifier finished with 4 verified, 3 errors
