Strongest Postcondition
File "bench/ce/double_projection.mlw", line 19, characters 15-22:
Sub-goal Postcondition of goal f'vc.
Prover result is: Unknown (sat)
The following counterexample model has not been verified
  (not checking CE model, missing option --check-ce):
File double_projection.mlw:
  Line 17:
    x [@introduced] =
      {"proj_name": "c",
       "type": "Proj",
       "value": {"type": "Integer", "val": "1"}}
  Line 19:
    x [@introduced] [@model_trace:x] =
      {"proj_name": "c",
       "type": "Proj",
       "value": {"type": "Integer", "val": "1"}}
  Line 21:
    _t [@W:unused_variable:N] [@id:unused] [@introduced] [@model_trace:_t] =
      {"proj_name": "c",
       "type": "Proj",
       "value": {"type": "Integer", "val": "1"}}

