fails:Net::FTP#dir when switching type fails raises a Net::FTPPermError when the response code is 500
fails:Net::FTP#dir when switching type fails raises a Net::FTPPermError when the response code is 501
fails:Net::FTP#dir when switching type fails raises a Net::FTPPermError when the response code is 504
fails:Net::FTP#dir when switching type fails raises a Net::FTPPermError when the response code is 530
fails:"Net::FTP#dir when switching type fails raises a Net::FTPPermError when the response code is 500"
fails:"Net::FTP#dir when switching type fails raises a Net::FTPPermError when the response code is 501"
fails:"Net::FTP#dir when switching type fails raises a Net::FTPPermError when the response code is 504"
fails:"Net::FTP#dir when switching type fails raises a Net::FTPPermError when the response code is 530"
