Will Robertson wrote:
> Hmmm. Well.
> I suppose it's out of the question to have both options, where
> ">{\processor}" is a shorthand for, say, ">> \l_xparse_arg_toks
> {\processor}". Or have ">*{\processor}" that uses \l_xparse_arg_tl instead.
> Both of these solutions seem to be more like avoiding the issue than
> solving it :) They certainly don't help simplify the situation.

As I said, I'd be happy to avoid the issue entirely if there is a way to
not need a return variable. However, as a processor can do essentially
anything, I can't see a way to avoid it.
Joseph Wright