Refinement.dfy(15,4): Error BP5003: A postcondition might not hold on this return path.
Refinement.dfy(14,16): Related location: This is the postcondition that might not hold.
Execution trace:
    (0,0): anon0
Refinement.dfy[B](15,4): Error BP5003: A postcondition might not hold on this return path.
Refinement.dfy(33,19): Related location: This is the postcondition that might not hold.
Execution trace:
    (0,0): anon0
Refinement.dfy(69,15): Error: assertion violation
Execution trace:
    (0,0): anon0
Refinement.dfy(80,16): Error: assertion violation
Execution trace:
    (0,0): anon0
Refinement.dfy(99,11): Error BP5003: A postcondition might not hold on this return path.
Refinement.dfy(78,14): Related location: This is the postcondition that might not hold.
Execution trace:
    (0,0): anon0
    (0,0): anon4_Else
Refinement.dfy(102,2): Error BP5003: A postcondition might not hold on this return path.
Refinement.dfy(83,14): Related location: This is the postcondition that might not hold.
Execution trace:
    (0,0): anon0
Refinement.dfy(189,4): Error BP5003: A postcondition might not hold on this return path.
Refinement.dfy[IncorrectConcrete](121,14): Related location: This is the postcondition that might not hold.
Refinement.dfy(186,8): Related location
Execution trace:
    (0,0): anon0
Refinement.dfy(193,4): Error BP5003: A postcondition might not hold on this return path.
Refinement.dfy[IncorrectConcrete](129,14): Related location: This is the postcondition that might not hold.
Refinement.dfy(186,8): Related location
Execution trace:
    (0,0): anon0
    (0,0): anon4_Then
    (0,0): anon3
Refinement.dfy(199,6): Error: assertion violation
Refinement.dfy[IncorrectConcrete](137,23): Related location
Execution trace:
    (0,0): anon0

Dafny program verifier finished with 48 verified, 9 errors