class IRB::SLex

def match(token)
  case token
  when Array
  when String
    return match(token.split(//))
  else
    return @head.match_io(token)
  end
  ret = @head.match(token)
  D_DETAIL.exec_if{D_DETAIL.printf "match end: %s:%s\n", ret, token.inspect}
  ret
end