revset arguments on 2.2.1

[Peter Kronenberg]

I have a server running 2.2.1 and I can't figure out the arguments for the
result of revset.match

In my 3.9.2 code, I have

revsetQuery = ' ***query goes here*** '
revsetResult = revset.match(ui, revsetQuery)

Now, I want to reference revsetResult(repo) or revsetResult(repo. None),
both of which work in 3.9.2

But 2.2.1 doesn't like the second argument.  It's supposed to be a subset,
but not sure what to put if I don't want to specify a subset.

can anyone help?

thanks
Peter
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