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 suggest that pressing `?' a second time searches for a literal
question mark. With other words, the keystrokes
`i' `\' `?' `?'
would do the right thing.
Other info documents might benefit too, for example a C language
reference, since C has a `?' operator -- or even the info pages of the
info program itself.
Werner
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