update (Erubis::Context)

    # File lib/erubis/context.rb, line 65
        def update(context_or_hash)
          arg = context_or_hash
          if arg.is_a?(Hash)
            arg.each do |key, val|
              self[key] = val
            end
          else
            arg.instance_variables.each do |varname|
              key = varname[1..-1]
              val = arg.instance_variable_get(varname)
              self[key] = val
            end
          end
        end