# Reading from git-issue223.transcript

Verifying Impl$$_module.__default.Abs ...
  [1 proof obligation]  error
c:\DEV\Dafny\abs.dfy(4,4): Error BP5003: A postcondition might not hold on this return path.
c:\DEV\Dafny\abs.dfy(3,10): Related location: This is the postcondition that might not hold.
Execution trace:
    (0,0): anon0
COUNTEREXAMPLE_START {"States":[{"Column":0,"Line":0,"Name":"<initial>","Variables":[{"CanonicalName":"((- 320))","Name":"x","RealName":null,"Value":"((- 320))"},{"CanonicalName":"(**y#0)","Name":"y","RealName":null,"Value":"(**y#0)"}]},{"Column":15,"Line":3,"Name":"c:\\DEV\\Dafny\\abs.dfy(3,15): initial state","Variables":[{"CanonicalName":"((- 320))","Name":"x","RealName":null,"Value":"((- 320))"},{"CanonicalName":"(**y#0)","Name":"y","RealName":null,"Value":"(**y#0)"}]},{"Column":12,"Line":4,"Name":"c:\\DEV\\Dafny\\abs.dfy(4,12)","Variables":[{"CanonicalName":"((- 320))","Name":"x","RealName":null,"Value":"((- 320))"},{"CanonicalName":"((- 320))'1","Name":"y","RealName":null,"Value":"((- 320))'1"}]}]} COUNTEREXAMPLE_END
Verification completed successfully!
[SUCCESS] [[DAFNY-SERVER: EOM]]

Verifying Impl$$_module.__default.Abs ...
Retrieving cached verification result for implementation Impl$$_module.__default.Abs...
  [0 proof obligations]  error
c:\DEV\Dafny\abs.dfy(4,4): Error BP5003: A postcondition might not hold on this return path.
c:\DEV\Dafny\abs.dfy(3,10): Related location: This is the postcondition that might not hold.
Execution trace:
    (0,0): anon0
COUNTEREXAMPLE_START {"States":[{"Column":0,"Line":0,"Name":"<initial>","Variables":[{"CanonicalName":"((- 320))","Name":"x","RealName":null,"Value":"((- 320))"},{"CanonicalName":"(**y#0)","Name":"y","RealName":null,"Value":"(**y#0)"}]},{"Column":15,"Line":3,"Name":"c:\\DEV\\Dafny\\abs.dfy(3,15): initial state","Variables":[{"CanonicalName":"((- 320))","Name":"x","RealName":null,"Value":"((- 320))"},{"CanonicalName":"(**y#0)","Name":"y","RealName":null,"Value":"(**y#0)"}]},{"Column":12,"Line":4,"Name":"c:\\DEV\\Dafny\\abs.dfy(4,12)","Variables":[{"CanonicalName":"((- 320))","Name":"x","RealName":null,"Value":"((- 320))"},{"CanonicalName":"((- 320))'1","Name":"y","RealName":null,"Value":"((- 320))'1"}]}]} COUNTEREXAMPLE_END
Verification completed successfully!
[SUCCESS] [[DAFNY-SERVER: EOM]]
Verification completed successfully!
[SUCCESS] [[DAFNY-SERVER: EOM]]
