_invoke_for_class_method

# File lib/bundler/vendor/thor/lib/thor/group.rb, line 265
  def _invoke_for_class_method(klass, command = nil, *args, &block) #:nodoc:
    with_padding do
      if block
        case block.arity
        when 3
          yield(self, klass, command)
        when 2
          yield(self, klass)
        when 1
          instance_exec(klass, &block)
        end
      else
        invoke klass, command, *args
      end
    end
  end