File "bench/check-ce/loop_inv_int.mlw", line 13, characters 16-25:
Sub-goal Loop invariant init of goal f'vc.
Prover result is: Valid (7 steps).

<check_ce:categorization>Categorizations of models:
- Selected model 0: NC
  - Concrete RAC: FAILURE (loop invariant preservation at "bench/check-ce/loop_inv_int.mlw", line 13, characters 16-25)
  - Abstract RAC: STUCK (when reaching the end of a loop iteration at "bench/check-ce/loop_inv_int.mlw", line 12, character 2 to line 15, character 6)
- Checked model 1: NC
  - Concrete RAC: FAILURE (loop invariant preservation at "bench/check-ce/loop_inv_int.mlw", line 13, characters 16-25)
  - Abstract RAC: FAILURE (loop invariant preservation at "bench/check-ce/loop_inv_int.mlw", line 13, characters 16-25)
- Checked model 2: NC
  - Concrete RAC: FAILURE (loop invariant preservation at "bench/check-ce/loop_inv_int.mlw", line 13, characters 16-25)
  - Abstract RAC: FAILURE (loop invariant preservation at "bench/check-ce/loop_inv_int.mlw", line 13, characters 16-25)
File "bench/check-ce/loop_inv_int.mlw", line 13, characters 16-25:
Sub-goal Loop invariant preservation of goal f'vc.
Prover result is: Unknown (unknown) (16 steps).
The program does not comply to the verification goal, for example during the
  following execution:
File int.mlw:
  Line 13:
    Constant zero initialization
    zero = 0
  Line 14:
    Constant one initialization
    one = 1
Unknown location:
    _ = ()
File loop_inv_int.mlw:
  Line 6:
    _ = ()
    Execution of main function `f` with env:
      _ = ()
      zero = 0
      one = 1
  Line 9:
    Normal execution of function `ref` with args:
      contents = 0
    Normal execution of function `ref'mk` with args:
      contents = 0
  Line 11:
    Normal execution of function `ref` with args:
      contents = 2
    Normal execution of function `ref'mk` with args:
      contents = 2
  Line 12:
    Normal execution of function `contents` with args:
      arg = {contents= 2}
    Normal execution of function `(<)` with args:
      _ = 2
      _ = 10
    Normal iteration of loop
  Line 14:
    Normal execution of function `contents` with args:
      arg = {contents= 2}
    Normal execution of function `contents` with args:
      arg = {contents= 1}
    Normal execution of function `(+)` with args:
      _ = 1
      _ = 2
  Line 12:
    Normal execution of function `contents` with args:
      arg = {contents= 3}
    Normal execution of function `(<)` with args:
      _ = 3
      _ = 10
    Normal iteration of loop
  Line 14:
    Normal execution of function `contents` with args:
      arg = {contents= 3}
    Normal execution of function `contents` with args:
      arg = {contents= 1}
    Normal execution of function `(+)` with args:
      _ = 1
      _ = 3
  Line 12:
    Normal execution of function `contents` with args:
      arg = {contents= 4}
    Normal execution of function `(<)` with args:
      _ = 4
      _ = 10
    Normal iteration of loop
  Line 14:
    Normal execution of function `contents` with args:
      arg = {contents= 4}
    Normal execution of function `contents` with args:
      arg = {contents= 1}
    Normal execution of function `(+)` with args:
      _ = 1
      _ = 4
  Line 12:
    Normal execution of function `contents` with args:
      arg = {contents= 5}
    Normal execution of function `(<)` with args:
      _ = 5
      _ = 10
    Normal iteration of loop
  Line 14:
    Normal execution of function `contents` with args:
      arg = {contents= 5}
    Normal execution of function `contents` with args:
      arg = {contents= 1}
    Normal execution of function `(+)` with args:
      _ = 1
      _ = 5
  Line 13:
    Property failure at loop invariant preservation with:
      a = {contents= 1}
      b = {contents= 6}

File "bench/check-ce/loop_inv_int.mlw", line 34, characters 16-25:
Sub-goal Loop invariant init of goal f'vc.
Prover result is: Valid (6 steps).

<check_ce:categorization>Categorizations of models:
- Selected model 0: NC
  - Concrete RAC: FAILURE (loop invariant preservation at "bench/check-ce/loop_inv_int.mlw", line 34, characters 16-25)
  - Abstract RAC: STUCK (when reaching the end of a loop iteration at "bench/check-ce/loop_inv_int.mlw", line 33, character 2 to line 36, character 6)
- Checked model 1: NC
  - Concrete RAC: FAILURE (loop invariant preservation at "bench/check-ce/loop_inv_int.mlw", line 34, characters 16-25)
  - Abstract RAC: FAILURE (loop invariant preservation at "bench/check-ce/loop_inv_int.mlw", line 34, characters 16-25)
- Checked model 2: NC
  - Concrete RAC: FAILURE (loop invariant preservation at "bench/check-ce/loop_inv_int.mlw", line 34, characters 16-25)
  - Abstract RAC: FAILURE (loop invariant preservation at "bench/check-ce/loop_inv_int.mlw", line 34, characters 16-25)
File "bench/check-ce/loop_inv_int.mlw", line 34, characters 16-25:
Sub-goal Loop invariant preservation of goal f'vc.
Prover result is: Unknown (unknown) (14 steps).
The program does not comply to the verification goal, for example during the
  following execution:
File int.mlw:
  Line 13:
    Constant zero initialization
    zero = 0
  Line 14:
    Constant one initialization
    one = 1
File loop_inv_int.mlw:
  Line 23:
    Constant a initialization
    (giant-step) execution of unimplemented function with args:
    result = 0
    Normal execution of function `ref` with args:
      contents = 0
    Normal execution of function `ref'mk` with args:
      contents = 0
    a = {contents= 0}
  Line 25:
    Constant b initialization
    (giant-step) execution of unimplemented function with args:
    result = 0
    Normal execution of function `ref` with args:
      contents = 0
    Normal execution of function `ref'mk` with args:
      contents = 0
    b = {contents= 0}
Unknown location:
    _ = ()
File loop_inv_int.mlw:
  Line 27:
    _ = ()
    Execution of main function `f` with env:
      a = {contents= 0}
      b = {contents= 0}
      _ = ()
      zero = 0
      one = 1
  Line 33:
    Normal execution of function `contents` with args:
      arg = {contents= 2}
    Normal execution of function `(<)` with args:
      _ = 2
      _ = 10
    Normal iteration of loop
  Line 35:
    Normal execution of function `contents` with args:
      arg = {contents= 2}
    Normal execution of function `contents` with args:
      arg = {contents= 1}
    Normal execution of function `(+)` with args:
      _ = 1
      _ = 2
  Line 33:
    Normal execution of function `contents` with args:
      arg = {contents= 3}
    Normal execution of function `(<)` with args:
      _ = 3
      _ = 10
    Normal iteration of loop
  Line 35:
    Normal execution of function `contents` with args:
      arg = {contents= 3}
    Normal execution of function `contents` with args:
      arg = {contents= 1}
    Normal execution of function `(+)` with args:
      _ = 1
      _ = 3
  Line 33:
    Normal execution of function `contents` with args:
      arg = {contents= 4}
    Normal execution of function `(<)` with args:
      _ = 4
      _ = 10
    Normal iteration of loop
  Line 35:
    Normal execution of function `contents` with args:
      arg = {contents= 4}
    Normal execution of function `contents` with args:
      arg = {contents= 1}
    Normal execution of function `(+)` with args:
      _ = 1
      _ = 4
  Line 33:
    Normal execution of function `contents` with args:
      arg = {contents= 5}
    Normal execution of function `(<)` with args:
      _ = 5
      _ = 10
    Normal iteration of loop
  Line 35:
    Normal execution of function `contents` with args:
      arg = {contents= 5}
    Normal execution of function `contents` with args:
      arg = {contents= 1}
    Normal execution of function `(+)` with args:
      _ = 1
      _ = 5
  Line 34:
    Property failure at loop invariant preservation with:
      a = {contents= 1}
      b = {contents= 6}

File "bench/check-ce/loop_inv_int.mlw", line 29, characters 12-22:
Sub-goal Postcondition of goal f'vc.
Prover result is: Valid (7 steps).

