[bug #15195] misleading error message

[Eric Blake]

Follow-up Comment #6, bug #15195 (project findutils):

A couple more misleading messages, even with your latest patches:

currently:
$ find \( -true -a ! \)
find: invalid expression; you have too many ')'

nicer:
$ find \( -true -a ! \)
find: expected an expression after '!'

currently:
$ find \(
find: invalid expression; empty parentheses are not allowed.

nicer:
$ find \(
find: invalid expression; I was expecting to find a ')' somewhere but did not
see one.


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