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(69,16): Error: assertion violation
Execution trace:
    (0,0): anon0
Refinement.dfy(80,17): Error: assertion violation
Execution trace:
    (0,0): anon0
Refinement.dfy(99,12): Error BP5003: A postcondition might not hold on this return path.
Refinement.dfy(78,15): Related location: This is the postcondition that might not hold.
Execution trace:
    (0,0): anon0
    (0,0): anon3_Else
Refinement.dfy(102,3): Error BP5003: A postcondition might not hold on this return path.
Refinement.dfy(83,15): Related location: This is the postcondition that might not hold.
Execution trace:
    (0,0): anon0
Refinement.dfy(189,5): Error BP5003: A postcondition might not hold on this return path.
Refinement.dfy[IncorrectConcrete](121,15): Related location: This is the postcondition that might not hold.
Refinement.dfy(186,9): Related location
Execution trace:
    (0,0): anon0
Refinement.dfy(193,5): Error BP5003: A postcondition might not hold on this return path.
Refinement.dfy[IncorrectConcrete](129,15): Related location: This is the postcondition that might not hold.
Refinement.dfy(186,9): Related location
Execution trace:
    (0,0): anon0
    (0,0): anon4_Then
    (0,0): anon3
Refinement.dfy(199,7): Error: assertion violation
Refinement.dfy[IncorrectConcrete](137,24): Related location
Execution trace:
    (0,0): anon0

Dafny program verifier finished with 48 verified, 9 errors