TypeAntecedents.dfy(35,12): Error: assertion violation
Execution trace:
    (0,0): anon0
TypeAntecedents.dfy(58,0): Error BP5003: A postcondition might not hold on this return path.
TypeAntecedents.dfy(57,14): Related location: This is the postcondition that might not hold.
Execution trace:
    (0,0): anon0
    (0,0): anon21_Then
    (0,0): anon6
    (0,0): anon24_Then
    (0,0): anon8
    (0,0): anon25_Else
    (0,0): anon26_Else
    (0,0): anon27_Then
    (0,0): anon16
    (0,0): anon28_Then
    (0,0): anon29_Then
    (0,0): anon20
TypeAntecedents.dfy(66,15): Error: assertion violation
Execution trace:
    (0,0): anon0
    (0,0): anon21_Else
    (0,0): anon22_Then
    (0,0): anon23_Else
TypeAntecedents.dfy(80,47): Error: target object may not be allocated
Execution trace:
    (0,0): anon0
    (0,0): anon21_Then
    (0,0): anon6
    (0,0): anon24_Then
    (0,0): anon8
    (0,0): anon25_Else
    (0,0): anon26_Else
    (0,0): anon27_Then
TypeAntecedents.dfy(82,52): Error: target object may not be allocated
Execution trace:
    (0,0): anon0
    (0,0): anon21_Then
    (0,0): anon6
    (0,0): anon24_Then
    (0,0): anon8
    (0,0): anon25_Else
    (0,0): anon26_Else
    (0,0): anon27_Then
    (0,0): anon16
    (0,0): anon28_Then

Dafny program verifier finished with 5 verified, 5 errors
