Previously, code like this would fail with an error
about an unrecognized ) token:

( this is a ( nested ) comment )

With this patch, the above code will now work.

Relatedly, it was previously possible to write code
that compiled but was confusing:

(open parenthesis should have a space )
( in this case the ADD2 will be ignored )ADD2
( this comment with ( would have been fine )

With this commit, the first example will emit a warning
but continue to work as intended. The second and third
examples will continue searching for a matching ) token,
which due to the new nested coment behavior will probably
mean the rest of the file gets commented out.