[Octave-bug-tracker] [bug #58751] Calling an undefined function ignoring first output value throws strange error message

[Fernando]

URL:
  <https://savannah.gnu.org/bugs/?58751>

                 Summary: Calling an undefined function ignoring first output
value throws strange error message
                 Project: GNU Octave
            Submitted by: tutissanalio
            Submitted on: sáb 11 jul 2020 18:42:30 UTC
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Unexpected Error
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 6.0.90
         Discussion Lock: Any
        Operating System: Any

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Details:

The following happens in Octave 6.0.1 (hg id: 7a17dfa7716d)


>> [~,b]=non_existing         % non_existing does not exist 
error: if: undefined value used in conditional expression
error: called from
    __unimplemented__ at line 520 column 9


Of course, an error should be thrown, but the error error message is very
strange. If the first output is not ignored, the error message is correct:


>> non_existing
error: 'non_existing' undefined near line 1, column 1
>> [a,b]=non_existing
error: 'non_existing' undefined near line 1, column 1
>> [a,~]=non_existing
error: 'non_existing' undefined near line 1, column 1


The problem also happens if the function is defined but does not give a value
for its second output argument. For example:


>> function [a,b]=f(msg), a=msg; end
>> [~,b]=f('something')
error: if: undefined value used in conditional expression
error: called from
    __unimplemented__ at line 520 column 9







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