    # File lib/facets/core/kernel/call_stack.rb, line 23
      def call_stack( level = 1 )
        call_str_array = pp_call_stack(level)
        stack = []
        call_str_array.each{ |call_str|
          file, lineno, method = call_str.split(':')
          if method =~ /in `(.*)'/ then
            method = $1.intern()
          end
          stack << [file, lineno.to_i, method]
        }
        stack
      end