In groff there exists an escape `\?', which has proper index entries.
In the info program, because `?' is used as the completion character,
it isn't possible currently to search for `\?'.
I believe it can be done with C-q ?.
I suggest that pressing `?' a second time searches for a literal
question mark.
I have no objection (it would be nice if that could be done more
universally in Emacs, in fact), but standalone info is nowhere on my
list of priorities.
I added it to the bug tracker at savannah, which is where I've been
keeping such wishlist items, in case someday someone is actually
interested in working on info again.
Thanks,
Karl
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