ok   plain: terms
ok   plain: no operators
ok   full: from
ok   full: subject phrase
ok   full: has_attachment
ok   full: is_unread
ok   full: after
ok   full: free term kept
ok   full: has_operators
ok   unbalanced quote
ok   empty op: no from
ok   empty op: no subject
ok   empty op: no operators flagged
ok   bad date: after null
ok   bad date: token becomes text
ok   fr date
ok   newer_than sets after
ok   older_than sets before
ok   unknown op kept as text
ok   unknown op: no operators flagged
ok   is:read -> is_unread false
ok   is:starred
ok   folder alias
ok   since alias -> after
ok   until alias -> before
ok   kql from
ok   kql subject grouped
ok   kql hasAttachments
ok   kql isRead:false
ok   kql received>=
ok   kql free term
ok   kql joined by AND
ok   kql no double quote
ok   kql no stray colon in value
ok   imap FROM
ok   imap SUBJECT
ok   imap UNSEEN
ok   imap SINCE
ok   imap TEXT
ok   imap empty -> ALL
ok   imap no unescaped inner quote

----
41 ok, 0 FAIL