[Octave-bug-tracker] [bug #59451] Function handles become invalid if path to function is removed

[Markus Mützel]

Update of bug #59451 (project octave):

                  Status:               Need Info => Confirmed              
        Operating System:               GNU/Linux => Any                    
                 Summary: Function handle loses reference to its target
function => Function handles become invalid if path to function is removed

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Follow-up Comment #2:

Following the steps you describe with Octave 6.0.92 on Windows, I see the
following:

>> cd ../tests
>> moxunit_runtests
warning: isdir is obsolete; use isfolder or dir_in_loadpath instead
suite: 99 tests
.............................ss..s.warning: findstr is obsolete; use strfind
instead
F........................
..sF..................warning: strmatch is obsolete; use strncmp or strcmp
instead
.................
--------------------------------------------------

skipped: resetting the warning state seems not to work (TODO: file a bug
report?)

skipped: <matlab.unittest.Test> class is not available

skipped: 'test_moxunit_runtests_basics' is very slow in Octave on Windows!

failure: invalid function handle, unable to find function for
@moxunit_set_path
  test_moxunit_set_path>helper_test_with_subdir:30
(D:\SVN\Octave\MOxUnit-master\tests\test_moxunit_set_path.m)
  test_moxunit_set_path>test_moxunit_set_path_root:9
(D:\SVN\Octave\MOxUnit-master\tests\test_moxunit_set_path.m)

skipped: 'test_different_args_subfunction' is very slow in Octave on Windows!

failure: elements are not equal

First input: 1x1 logical
0

Second input: 1x1 logical
1
  assertEqual:70 (D:\SVN\Octave\MOxUnit-master\MOxUnit\assertEqual.m)
 
test_moxunit_util_platform_supports>test_moxunit_util_platform_supports_localfunctions_in_script:18
(D:\SVN\Octave\MOxUnit-master\tests\test_moxunit_util_platform_supports.m)

--------------------------------------------------

FAILED (passed=93, skipped=4, failure=2)
ans = 0


Looking at the first failing test, a simpler test to reproduce this error is
(using the GUI):

mkdir bug59451_func_handle_path
edit bug59451_func_handle_path/fun.m
addpath bug59451_func_handle_path
fh = @fun
rmpath bug59451_func_handle_path
fh(1,2)


The last line fails with the following error message in 6.0.92:

>> fh(1,2)
error: invalid function handle, unable to find function for @fun


The function handle could still be called in 5.2.0 after the path to the
function was removed.

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  <https://savannah.gnu.org/bugs/?59451>

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