eliminate direct access to call stack from evaluator The call stack is an internal implementation detail of the evaluator. Direct access to it outside of the evlauator should not be needed. * pt-eval.h (tree_evaluator::get_call_stack): Delete.

classdef bug53956_class_4 < bug53956_class_3
  properties
  end
  methods
    function delete (self)
      global dtor4_called
      dtor4_called++;
    end
  end
end