class Thor::Command

def handle_argument_error?(instance, error, caller)
  not_debugging?(instance) && error.message =~ /wrong number of arguments/ && begin
    saned = sans_backtrace(error.backtrace, caller)
    # Ruby 1.9 always include the called method in the backtrace
    saned.empty? || (saned.size == 1 && RUBY_VERSION >= '1.9')
  end
end