> Now creating file at expression parsing time, creates files even if
> the find(1) expressions end up erroring out.

Right.  Parse time is too early (IMO); I think it should be deferred
until a point between parsing and execution.

Yes, this means a few code changes.  They shouldn't be too big - just
walk the expression tree with a function which does any post-parse
pre-execute actions, currently only opening -fprint files....

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