valid_const?

# File railties/lib/rails/generators/rails/plugin/plugin_generator.rb, line 376
      def valid_const?
        if /-\d/.match?(original_name)
          raise Error, "Invalid plugin name #{original_name}. Please give a name which does not contain a namespace starting with numeric characters."
        elsif /[^\w-]+/.match?(original_name)
          raise Error, "Invalid plugin name #{original_name}. Please give a name which uses only alphabetic, numeric, \"_\" or \"-\" characters."
        elsif /^\d/.match?(camelized)
          raise Error, "Invalid plugin name #{original_name}. Please give a name which does not start with numbers."
        elsif RESERVED_NAMES.include?(name)
          raise Error, "Invalid plugin name #{original_name}. Please give a "                         "name which does not match one of the reserved rails "                         "words: #{RESERVED_NAMES.join(", ")}"
        elsif Object.const_defined?(camelized)
          raise Error, "Invalid plugin name #{original_name}, constant #{camelized} is already in use. Please choose another plugin name."
        end
      end