Refinement.dfy(15,5): Error BP5003: A postcondition might not hold on this return path.
Refinement.dfy(14,17): Related location: This is the postcondition that might not hold.
Execution trace:
    (0,0): anon0
Refinement.dfy[B](15,5): Error BP5003: A postcondition might not hold on this return path.
Refinement.dfy(33,20): Related location: This is the postcondition that might not hold.
Execution trace:
    (0,0): anon0
Refinement.dfy(64,14): Error: assertion violation
Execution trace:
    (0,0): anon0
Refinement.dfy(74,17): Error: assertion violation
Execution trace:
    (0,0): anon0
Refinement.dfy(93,12): Error BP5003: A postcondition might not hold on this return path.
Refinement.dfy(72,15): Related location: This is the postcondition that might not hold.
Execution trace:
    (0,0): anon0
    (0,0): anon3_Else
Refinement.dfy(96,3): Error BP5003: A postcondition might not hold on this return path.
Refinement.dfy(77,15): Related location: This is the postcondition that might not hold.
Execution trace:
    (0,0): anon0
Refinement.dfy(183,5): Error BP5003: A postcondition might not hold on this return path.
Refinement.dfy[IncorrectConcrete](115,15): Related location: This is the postcondition that might not hold.
Refinement.dfy(180,9): Related location
Execution trace:
    (0,0): anon0
Refinement.dfy(187,5): Error BP5003: A postcondition might not hold on this return path.
Refinement.dfy[IncorrectConcrete](123,15): Related location: This is the postcondition that might not hold.
Refinement.dfy(180,9): Related location
Execution trace:
    (0,0): anon0
    (0,0): anon4_Then
    (0,0): anon3
Refinement.dfy(193,7): Error: assertion violation
Refinement.dfy[IncorrectConcrete](131,24): Related location
Execution trace:
    (0,0): anon0

Dafny program verifier finished with 48 verified, 9 errors