    # File lib/active_support/memoizable.rb, line 44
          def flush_cache(*syms, &block)
            syms.each do |sym|
              methods.each do |m|
                if m.to_s =~ /^_unmemoized_(#{sym})/
                  ivar = ActiveSupport::Memoizable.memoized_ivar_for($1)
                  instance_variable_get(ivar).clear if instance_variable_defined?(ivar)
                end
              end
            end
          end