[Octave-bug-tracker] [bug #58695] List is left empty if an item is a function call returning nothing

[Fernando]

URL:
  <https://savannah.gnu.org/bugs/?58695>

                 Summary: List is left empty if an item is a function call
returning nothing
                 Project: GNU Octave
            Submitted by: tutissanalio
            Submitted on: vie 03 jul 2020 10:41:24 UTC
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Missed Error or Warning
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: dev
         Discussion Lock: Any
        Operating System: GNU/Linux

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Details:

Checking bug #58686 I found the following incorrect behaviour in Octave 7.0.0
(hg id: d5311ca8f945):


octave:1> [2,do_nothing(3),5,3]
ans = [](0x0)


where do_nothing is a function that.. well, does nothing:


function retval = do_nothing(n)
end


The same in Octave 4.2.2:

octave:1> [2,do_nothing(3),5,3]
warning: do_nothing: some elements in list of return values are undefined
warning: called from
    do_nothing at line 2 column 1
ans =
   2   5   3


The same in Matlab 2020a:

>> [2,do_nothing(3),5,3]
Output argument "retval" (and maybe others) not assigned during call to
"do_nothing".






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