File "bench/check-ce/underspec.mlw", line 17, characters 27-33:
Sub-goal Loop invariant init of goal f'vc.
Prover result is: Valid (0.02s, 69 steps).

<check-ce>Check model 0 ("bench/check-ce/underspec.mlw", line 17, characters 27-33)
<check-ce>Checking model:
          File underspec.mlw:
            Line 16:
              i = {"type": "Integer", "val": "0"}
              x1 =
                {"type": "Record",
                 "val":
                  {"Field":
                    [{"field": "contents",
                      "value": {"type": "Integer", "val": "-401"}}]}}
            Line 17:
              x1 =
                {"type": "Record",
                 "val":
                  {"Field":
                    [{"field": "contents",
                      "value": {"type": "Integer", "val": "-400"}}]}}
              x1 =
                {"type": "Record",
                 "val":
                  {"Field":
                    [{"field": "contents",
                      "value": {"type": "Integer", "val": "-400"}}]}}
            Line 18:
              result = {"type": "Boolean", "val": true}
            Line 19:
              x1 =
                {"type": "Record",
                 "val":
                  {"Field":
                    [{"field": "contents",
                      "value": {"type": "Integer", "val": "-400"}}]}}
<check-ce>Giant-step RAC
<rac-values>RHS evaluated for global `zero` at "WHY3DATA/stdlib/int.mlw", line 13, characters 15-19: 0
<rac-values>RHS evaluated for global `one` at "WHY3DATA/stdlib/int.mlw", line 14, characters 15-18: 1
<rac-values>Type default value for parameter `_` at NO LOC: ()
<rac-values>Value computed from postcondition for return value of call to ref at "bench/check-ce/underspec.mlw", line 14, characters 17-18 at "bench/check-ce/underspec.mlw", line 14, characters 17-18: {contents=
                                                                    0}
<rac-values>Value computed from postcondition for return value of call to ref at "bench/check-ce/underspec.mlw", line 15, characters 17-18 at "bench/check-ce/underspec.mlw", line 15, characters 17-18: {contents=
                                                                    0}
<rac-values>Value from model for variable `x1` at "bench/check-ce/underspec.mlw", line 16, characters 4-139 at "bench/check-ce/underspec.mlw", line 16, characters 4-139: {contents=
                                                                    (-401)}
<rac-values>Type default value for variable `x2` at "bench/check-ce/underspec.mlw", line 16, characters 4-139 at "bench/check-ce/underspec.mlw", line 16, characters 4-139: {contents=
                                                                    0}
<rac-values>Value from model for variable `i` at "bench/check-ce/underspec.mlw", line 16, characters 8-9: 0
<check-ce>Normal RAC
<rac-values>RHS evaluated for global `zero` at "WHY3DATA/stdlib/int.mlw", line 13, characters 15-19: 0
<rac-values>RHS evaluated for global `one` at "WHY3DATA/stdlib/int.mlw", line 14, characters 15-18: 1
<rac-values>Type default value for parameter `_` at NO LOC: ()
<check-ce>Result of checking model 0: SW
            - Concrete RAC: NORMAL
              File int.mlw:
                Line 13:
                  Constant zero initialization
                  zero = 0
                Line 14:
                  Constant one initialization
                  one = 1
              Unknown location:
                  _ = ()
              File underspec.mlw:
                Line 13:
                  _ = ()
                  Execution of main function `f` with env:
                    _ = ()
                    zero = 0
                    one = 1
                Line 14:
                  Normal execution of function `ref` with args:
                    contents = 0
                  Normal execution of function `ref'mk` with args:
                    contents = 0
                Line 15:
                  Normal execution of function `ref` with args:
                    contents = 0
                  Normal execution of function `ref'mk` with args:
                    contents = 0
                Line 16:
                  Normal iteration of loop
                Line 18:
                  Normal execution of function `(=)` with args:
                    x = 0
                    y = 0
                Line 19:
                  Normal execution of function `contents` with args:
                    arg = {contents= 0}
                  Normal execution of function `(+)` with args:
                    _ = 0
                    _ = 1
                Line 16:
                  Normal iteration of loop
                Line 18:
                  Normal execution of function `(=)` with args:
                    x = 1
                    y = 0
                Line 21:
                  Normal execution of function `contents` with args:
                    arg = {contents= 0}
                  Normal execution of function `(+)` with args:
                    _ = 0
                    _ = 1
                Line 13:
                  Execution of main function terminated normally
            - Abstract RAC: FAILURE (loop invariant preservation at "bench/check-ce/underspec.mlw", line 17, characters 18-33)
              File int.mlw:
                Line 13:
                  Constant zero initialization
                  zero = 0
                Line 14:
                  Constant one initialization
                  one = 1
              Unknown location:
                  _ = ()
              File underspec.mlw:
                Line 13:
                  _ = ()
                  Execution of main function `f` with env:
                    _ = ()
                    zero = 0
                    one = 1
                Line 14:
                  Giant-step execution of function `ref` with args:
                    contents = 0
                  result of `ref` = {contents= 0}
                Line 15:
                  Giant-step execution of function `ref` with args:
                    contents = 0
                  result of `ref` = {contents= 0}
                Line 16:
                  Giant-step iteration of loop
                  x1 = {contents= (-401)}
                  x2 = {contents= 0}
                  i = 0
                  Giant-step iteration of loop
                Line 18:
                  Normal execution of function `(=)` with args:
                    x = 0
                    y = 0
                Line 19:
                  Normal execution of function `contents` with args:
                    arg = {contents= (-401)}
                  Normal execution of function `(+)` with args:
                    _ = (-401)
                    _ = 1
                Line 17:
                  Property failure at loop invariant preservation with:
                    x1 = {contents= (-400)}
                    i = 1
<check-ce>Check model 1 ("bench/check-ce/underspec.mlw", line 17, characters 27-33)
<check-ce>Checking model:
          
<check-ce>Giant-step RAC
<rac-values>RHS evaluated for global `zero` at "WHY3DATA/stdlib/int.mlw", line 13, characters 15-19: 0
<rac-values>RHS evaluated for global `one` at "WHY3DATA/stdlib/int.mlw", line 14, characters 15-18: 1
<rac-values>Type default value for parameter `_` at NO LOC: ()
<rac-values>Value computed from postcondition for return value of call to ref at "bench/check-ce/underspec.mlw", line 14, characters 17-18 at "bench/check-ce/underspec.mlw", line 14, characters 17-18: {contents=
                                                                    0}
<rac-values>Value computed from postcondition for return value of call to ref at "bench/check-ce/underspec.mlw", line 15, characters 17-18 at "bench/check-ce/underspec.mlw", line 15, characters 17-18: {contents=
                                                                    0}
<rac-values>Type default value for variable `x1` at "bench/check-ce/underspec.mlw", line 16, characters 4-139 at "bench/check-ce/underspec.mlw", line 16, characters 4-139: {contents=
                                                                    0}
<rac-values>Type default value for variable `x2` at "bench/check-ce/underspec.mlw", line 16, characters 4-139 at "bench/check-ce/underspec.mlw", line 16, characters 4-139: {contents=
                                                                    0}
<rac-values>Default value for variable `i` at "bench/check-ce/underspec.mlw", line 16, characters 8-9: 2
<check-ce>Normal RAC
<rac-values>RHS evaluated for global `zero` at "WHY3DATA/stdlib/int.mlw", line 13, characters 15-19: 0
<rac-values>RHS evaluated for global `one` at "WHY3DATA/stdlib/int.mlw", line 14, characters 15-18: 1
<rac-values>Type default value for parameter `_` at NO LOC: ()
<check-ce>Result of checking model 1: BAD_CE
            - Concrete RAC: NORMAL
              File int.mlw:
                Line 13:
                  Constant zero initialization
                  zero = 0
                Line 14:
                  Constant one initialization
                  one = 1
              Unknown location:
                  _ = ()
              File underspec.mlw:
                Line 13:
                  _ = ()
                  Execution of main function `f` with env:
                    _ = ()
                    zero = 0
                    one = 1
                Line 14:
                  Normal execution of function `ref` with args:
                    contents = 0
                  Normal execution of function `ref'mk` with args:
                    contents = 0
                Line 15:
                  Normal execution of function `ref` with args:
                    contents = 0
                  Normal execution of function `ref'mk` with args:
                    contents = 0
                Line 16:
                  Normal iteration of loop
                Line 18:
                  Normal execution of function `(=)` with args:
                    x = 0
                    y = 0
                Line 19:
                  Normal execution of function `contents` with args:
                    arg = {contents= 0}
                  Normal execution of function `(+)` with args:
                    _ = 0
                    _ = 1
                Line 16:
                  Normal iteration of loop
                Line 18:
                  Normal execution of function `(=)` with args:
                    x = 1
                    y = 0
                Line 21:
                  Normal execution of function `contents` with args:
                    arg = {contents= 0}
                  Normal execution of function `(+)` with args:
                    _ = 0
                    _ = 1
                Line 13:
                  Execution of main function terminated normally
            - Abstract RAC: STUCK (failure in loop invariant preservation after last iteration at "bench/check-ce/underspec.mlw", line 17, characters 18-33)
              File int.mlw:
                Line 13:
                  Constant zero initialization
                  zero = 0
                Line 14:
                  Constant one initialization
                  one = 1
              Unknown location:
                  _ = ()
              File underspec.mlw:
                Line 13:
                  _ = ()
                  Execution of main function `f` with env:
                    _ = ()
                    zero = 0
                    one = 1
                Line 14:
                  Giant-step execution of function `ref` with args:
                    contents = 0
                  result of `ref` = {contents= 0}
                Line 15:
                  Giant-step execution of function `ref` with args:
                    contents = 0
                  result of `ref` = {contents= 0}
                Line 16:
                  Giant-step iteration of loop
                  x1 = {contents= 0}
                  x2 = {contents= 0}
                  i = 2
                Line 17:
                  Execution got stuck at loop invariant preservation after last iteration with:
                    x1 = {contents= 0}
                    i = 2
<check-ce-summary>Results:
- Selected model 0: SW
  - Concrete RAC: NORMAL
  - Abstract RAC: FAILURE (loop invariant preservation at "bench/check-ce/underspec.mlw", line 17, characters 18-33)
- Checked model 1: BAD_CE
  - Concrete RAC: NORMAL
  - Abstract RAC: STUCK (failure in loop invariant preservation after last iteration at "bench/check-ce/underspec.mlw", line 17, characters 18-33)
File "bench/check-ce/underspec.mlw", line 17, characters 27-33:
Sub-goal Loop invariant preservation of goal f'vc.
Prover result is: Unknown (unknown) (0.39s, 3000094 steps).
The contracts of some function or loop are too weak, 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 underspec.mlw:
  Line 13:
    _ = ()
    Execution of main function `f` with env:
      _ = ()
      zero = 0
      one = 1
  Line 14:
    Giant-step execution of function `ref` with args:
      contents = 0
    result of `ref` = {contents= 0}
  Line 15:
    Giant-step execution of function `ref` with args:
      contents = 0
    result of `ref` = {contents= 0}
  Line 16:
    Giant-step iteration of loop
    x1 = {contents= (-401)}
    x2 = {contents= 0}
    i = 0
    Giant-step iteration of loop
  Line 18:
    Normal execution of function `(=)` with args:
      x = 0
      y = 0
  Line 19:
    Normal execution of function `contents` with args:
      arg = {contents= (-401)}
    Normal execution of function `(+)` with args:
      _ = (-401)
      _ = 1
  Line 17:
    Property failure at loop invariant preservation with:
      x1 = {contents= (-400)}
      i = 1

File "bench/check-ce/underspec.mlw", line 17, characters 27-33:
Sub-goal Loop invariant preservation of goal f'vc.
Prover result is: Valid (0.00s, 2768 steps).

File "bench/check-ce/underspec.mlw", line 41, characters 14-23:
Sub-goal Postcondition of goal g'vc.
Prover result is: Valid (0.01s, 168 steps).

<check-ce>Check model 0 ("bench/check-ce/underspec.mlw", line 47, characters 13-18)
<check-ce>Checking model:
          File underspec.mlw:
            Line 41:
              z =
                {"type": "Record",
                 "val":
                  {"Field":
                    [{"field": "contents",
                      "value": {"type": "Integer", "val": "0"}}]}}
              z =
                {"type": "Record",
                 "val":
                  {"Field":
                    [{"field": "contents",
                      "value": {"type": "Integer", "val": "2"}}]}}
            Line 45:
              z =
                {"type": "Record",
                 "val":
                  {"Field":
                    [{"field": "contents",
                      "value": {"type": "Integer", "val": "0"}}]}}
            Line 46:
              z =
                {"type": "Record",
                 "val":
                  {"Field":
                    [{"field": "contents",
                      "value": {"type": "Integer", "val": "2"}}]}}
            Line 47:
              z =
                {"type": "Record",
                 "val":
                  {"Field":
                    [{"field": "contents",
                      "value": {"type": "Integer", "val": "2"}}]}}
<check-ce>Giant-step RAC
<rac-values>RHS evaluated for global `zero` at "WHY3DATA/stdlib/int.mlw", line 13, characters 15-19: 0
<rac-values>RHS evaluated for global `one` at "WHY3DATA/stdlib/int.mlw", line 14, characters 15-18: 1
<rac-values>Type default value for return value of call at "bench/check-ce/underspec.mlw", line 37, characters 11-16 at "bench/check-ce/underspec.mlw", line 37, characters 11-16: 0
<rac-values>RHS evaluated for global `z` at "bench/check-ce/underspec.mlw", line 37, characters 10-11: {contents=
                                                                    0}
<rac-values>Type default value for parameter `_` at NO LOC: ()
<rac-values>Value from model for variable `z` at "bench/check-ce/underspec.mlw", line 46, characters 4-8 at "bench/check-ce/underspec.mlw", line 46, characters 4-8: {contents=
                                                                    2}
<rac-values>Type default value for return value of call to g at "bench/check-ce/underspec.mlw", line 46, characters 4-8 at "bench/check-ce/underspec.mlw", line 46, characters 4-8: ()
<check-ce>Normal RAC
<rac-values>RHS evaluated for global `zero` at "WHY3DATA/stdlib/int.mlw", line 13, characters 15-19: 0
<rac-values>RHS evaluated for global `one` at "WHY3DATA/stdlib/int.mlw", line 14, characters 15-18: 1
<rac-values>Type default value for return value of call at "bench/check-ce/underspec.mlw", line 37, characters 11-16 at "bench/check-ce/underspec.mlw", line 37, characters 11-16: 0
<rac-values>RHS evaluated for global `z` at "bench/check-ce/underspec.mlw", line 37, characters 10-11: {contents=
                                                                    0}
<rac-values>Type default value for parameter `_` at NO LOC: ()
<check-ce>Result of checking model 0: SW
            - Concrete RAC: NORMAL
              File int.mlw:
                Line 13:
                  Constant zero initialization
                  zero = 0
                Line 14:
                  Constant one initialization
                  one = 1
              File underspec.mlw:
                Line 37:
                  Constant z 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
                  z = {contents= 0}
              Unknown location:
                  _ = ()
              File underspec.mlw:
                Line 44:
                  _ = ()
                  Execution of main function `f` with env:
                    z = {contents= 0}
                    _ = ()
                    zero = 0
                    one = 1
                Line 46:
                  Normal execution of function `Tuple0` with args:
                  Normal execution of function `g` with args:
                    _ = ()
                Line 42:
                  Normal execution of function `contents` with args:
                    arg = {contents= 0}
                  Normal execution of function `(+)` with args:
                    _ = 0
                    _ = 1
                Line 44:
                  Execution of main function terminated normally
            - Abstract RAC: FAILURE (assertion at "bench/check-ce/underspec.mlw", line 47, characters 13-18)
              File int.mlw:
                Line 13:
                  Constant zero initialization
                  zero = 0
                Line 14:
                  Constant one initialization
                  one = 1
              File underspec.mlw:
                Line 37:
                  Constant z 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
                  z = {contents= 0}
              Unknown location:
                  _ = ()
              File underspec.mlw:
                Line 44:
                  _ = ()
                  Execution of main function `f` with env:
                    z = {contents= 0}
                    _ = ()
                    zero = 0
                    one = 1
                Line 46:
                  Normal execution of function `Tuple0` with args:
                  Giant-step execution of function `g` with args:
                    _ = ()
                  z = {contents= 2}
                  result of `g` = ()
                Line 47:
                  Property failure at assertion with:
                    z = {contents= 2}
<check-ce>Check model 1 ("bench/check-ce/underspec.mlw", line 47, characters 13-18)
<check-ce>Checking model:
          
<check-ce>Giant-step RAC
<rac-values>RHS evaluated for global `zero` at "WHY3DATA/stdlib/int.mlw", line 13, characters 15-19: 0
<rac-values>RHS evaluated for global `one` at "WHY3DATA/stdlib/int.mlw", line 14, characters 15-18: 1
<rac-values>Type default value for return value of call at "bench/check-ce/underspec.mlw", line 37, characters 11-16 at "bench/check-ce/underspec.mlw", line 37, characters 11-16: 0
<rac-values>RHS evaluated for global `z` at "bench/check-ce/underspec.mlw", line 37, characters 10-11: {contents=
                                                                    0}
<rac-values>Type default value for parameter `_` at NO LOC: ()
<rac-values>Type default value for variable `z` at "bench/check-ce/underspec.mlw", line 46, characters 4-8 at "bench/check-ce/underspec.mlw", line 46, characters 4-8: {contents=
                                                                    0}
<rac-values>No value for return value of call to g at "bench/check-ce/underspec.mlw", line 46, characters 4-8 at "bench/check-ce/underspec.mlw", line 46, characters 4-8
<check-ce>Normal RAC
<rac-values>RHS evaluated for global `zero` at "WHY3DATA/stdlib/int.mlw", line 13, characters 15-19: 0
<rac-values>RHS evaluated for global `one` at "WHY3DATA/stdlib/int.mlw", line 14, characters 15-18: 1
<rac-values>Type default value for return value of call at "bench/check-ce/underspec.mlw", line 37, characters 11-16 at "bench/check-ce/underspec.mlw", line 37, characters 11-16: 0
<rac-values>RHS evaluated for global `z` at "bench/check-ce/underspec.mlw", line 37, characters 10-11: {contents=
                                                                    0}
<rac-values>Type default value for parameter `_` at NO LOC: ()
<check-ce>Result of checking model 1: INCOMPLETE
            - Concrete RAC: NORMAL
              File int.mlw:
                Line 13:
                  Constant zero initialization
                  zero = 0
                Line 14:
                  Constant one initialization
                  one = 1
              File underspec.mlw:
                Line 37:
                  Constant z 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
                  z = {contents= 0}
              Unknown location:
                  _ = ()
              File underspec.mlw:
                Line 44:
                  _ = ()
                  Execution of main function `f` with env:
                    z = {contents= 0}
                    _ = ()
                    zero = 0
                    one = 1
                Line 46:
                  Normal execution of function `Tuple0` with args:
                  Normal execution of function `g` with args:
                    _ = ()
                Line 42:
                  Normal execution of function `contents` with args:
                    arg = {contents= 0}
                  Normal execution of function `(+)` with args:
                    _ = 0
                    _ = 1
                Line 44:
                  Execution of main function terminated normally
            - Abstract RAC: INCOMPLETE (terminated because missing value for return value of call to g at "bench/check-ce/underspec.mlw", line 46, characters 4-8)
              
<check-ce-summary>Results:
- Selected model 0: SW
  - Concrete RAC: NORMAL
  - Abstract RAC: FAILURE (assertion at "bench/check-ce/underspec.mlw", line 47, characters 13-18)
- Checked model 1: INCOMPLETE
  - Concrete RAC: NORMAL
  - Abstract RAC: INCOMPLETE (terminated because missing value for return value of call to g at "bench/check-ce/underspec.mlw", line 46, characters 4-8)
File "bench/check-ce/underspec.mlw", line 47, characters 13-18:
Sub-goal Assertion of goal f'vc.
Prover result is: Unknown (unknown) (0.36s, 3000045 steps).
The contracts of some function or loop are too weak, for example during the
  following execution:
File int.mlw:
  Line 13:
    Constant zero initialization
    zero = 0
  Line 14:
    Constant one initialization
    one = 1
File underspec.mlw:
  Line 37:
    Constant z 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
    z = {contents= 0}
Unknown location:
    _ = ()
File underspec.mlw:
  Line 44:
    _ = ()
    Execution of main function `f` with env:
      z = {contents= 0}
      _ = ()
      zero = 0
      one = 1
  Line 46:
    Normal execution of function `Tuple0` with args:
    Giant-step execution of function `g` with args:
      _ = ()
    z = {contents= 2}
    result of `g` = ()
  Line 47:
    Property failure at assertion with:
      z = {contents= 2}

