internal: switch from trait-based TokenSource to simple struct of arrays #10995
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cc #10765
The idea here is to try to simplify the interface as best as we can. The original trait-based approach is a bit over-engineered and hard to debug. Here, we replace callback with just data. The next PR in series will replace the output
TreeSinktrait with data as well.The biggest drawback here is that we now require to materialize all parser's input up-front. This is a bad fit for macro by example: when you parse
$e:expr, you might consume only part of the input. However, today's trait-based solution doesn't really help -- we were already materializing the whole thing! So, let's keep it simple!