OpaqueFunctions.dfy(16,11): Error BP5003: A postcondition might not hold on this return path.
OpaqueFunctions.dfy(17,14): Related location: This is the postcondition that might not hold.
Execution trace:
    (0,0): anon0
    (0,0): anon4_Else
OpaqueFunctions.dfy(58,2): Error BP5003: A postcondition might not hold on this return path.
OpaqueFunctions.dfy(57,16): Related location: This is the postcondition that might not hold.
Execution trace:
    (0,0): anon0
OpaqueFunctions.dfy(65,2): Error BP5003: A postcondition might not hold on this return path.
OpaqueFunctions.dfy(64,16): Related location: This is the postcondition that might not hold.
Execution trace:
    (0,0): anon0

Dafny program verifier finished with 7 verified, 3 errors
