// Transform IMAPv4 "* LIST" lines to IMAPv3 "* MAILBOX"
if line.starts_with("* LIST") {
if let Some(last_slash_pos) = line.rfind("\"/\"") {
// Transform IMAPv4 "* LIST" lines to IMAPv3 "* MAILBOX"
if line.starts_with("* LIST") {
if let Some(last_slash_pos) = line.rfind("\"/\"") {