# File lib/bundler/vendor/thor.rb, line 326
      def find_subcommand(subcmd_name)
        possibilities = find_subcommand_possibilities subcmd_name
        if possibilities.size > 1
          raise "Ambiguous subcommand #{subcmd_name} matches [#{possibilities.join(', ')}]"
        elsif possibilities.size < 1
          return nil
        end

        possibilities.first
      end