Verifying CheckWellformed$$_0_M0.C.M ...
  [0 proof obligations]  verified

Verifying Impl$$_0_M0.C.M ...
  [5 proof obligations]  verified

Verifying CheckWellformed$$_0_M0.C.P ...
  [6 proof obligations]  verified

Verifying CheckWellformed$$_0_M0.C.Q ...
  [5 proof obligations]  error
Superposition.dfy(27,14): Error BP5003: A postcondition might not hold on this return path.
Superposition.dfy(28,25): Related location: This is the postcondition that might not hold.
Execution trace:
    (0,0): anon0
    (0,0): anon7_Else

Verifying CheckWellformed$$_0_M0.C.R ...
  [5 proof obligations]  error
Superposition.dfy(33,14): Error BP5003: A postcondition might not hold on this return path.
Superposition.dfy(34,25): Related location: This is the postcondition that might not hold.
Execution trace:
    (0,0): anon0
    (0,0): anon7_Else

Verifying CheckWellformed$$_1_M1.C.M ...
  [0 proof obligations]  verified

Verifying Impl$$_1_M1.C.M ...
  [1 proof obligation]  verified

Verifying CheckWellformed$$_1_M1.C.P ...
  [2 proof obligations]  error
Superposition.dfy(50,24): Error BP5003: A postcondition might not hold on this return path.
Superposition.dfy[M1](22,25): Related location: This is the postcondition that might not hold.
Execution trace:
    (0,0): anon0
    (0,0): anon9_Else
    (0,0): anon11_Then
    (0,0): anon8

Verifying CheckWellformed$$_1_M1.C.Q ...
  [0 proof obligations]  verified

Verifying CheckWellformed$$_1_M1.C.R ...
  [0 proof obligations]  verified

Dafny program verifier finished with 7 verified, 3 errors