[Octave-bug-tracker] [bug #65876] error retrieving data from struct values in containers.Maps

[John W. Eaton]

Follow-up Comment #4, bug #65876 (group octave):

The trouble seems to be due to this block of code in octave_classdef::subsref
in ov-classdef.cc:


          // If the number of output arguments is unknown, attempt to set up
          // a proper value for nargout at least in the simple case where the
          // cs-list-type expression - i.e., {} or ().x, is the leading one.
          if (nargout <= 0)
            {
              bool maybe_cs_list_query = (type[0] == '.' || type[0] == '{'
                                          || (type.length () > 1 && type[0] ==
'('
                                              && type[1] == '.'));

              if (maybe_cs_list_query)
                {
                  // Set up a proper nargout for the subsref call by calling
numel.
                  octave_value_list tmp;
                  int nout;
                  if (type[0] != '.') tmp = idx.front ();
                  nout = xnumel (tmp);
                  if (nargout != 0 || nout > 1)
                    nargout = nout;
                }
              else if (nargout < 0)
                nargout = 1;
            }


that was added in changeset
https://hg.savannah.gnu.org/hgweb/octave/rev/554a932fc6d0 in an attempt to fix
bug #63841.

Although there were some new tests committed for that bug in changeset
https://hg.savannah.gnu.org/hgweb/octave/rev/768df05d04f3, none of them fail
if I comment out the above code block *and* the example code from this bug
report works again.  I don't understand the point of the above code block. 
What problem was it trying to fix?


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