[Octave-bug-tracker] [bug #48086] 2nd-level nested function not found in anonymous function

[John W. Eaton]

Follow-up Comment #4, bug #48086 (project octave):

Rik: Thanks, I see it is attached now.  I think the problem is that anonymous
functions are not (yet) proper closures and they are not properly grabbing all
the context necessary to execute outside of the scope where they are defined. 
It works most of the time, but as you can see, when they call a nested
function the call stack is not right.  I see that the following modification
does work:


function main
  disp('main function')
  a = 1;
  nested(2)
  function z = nested(x)
    disp('nested')
    z = a+x;
    quad(@wrapper,z,1)
    function y = nested2(x,a)
      disp('nested2')
% here it does not work
      y = a.*sin(x);
    end
    function r = wrapper (q)
      r = nested2 (q, a);
    end
  end
end


Making anonymous functions behave more like a real nested functions should
solve this problem.  In the meantime, it appears there are several ways to
work around it.

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