trivia association

[elenakrittik]

figure out how to reliably attach trivia tokens (comments/whitespace) to relevant nodes

the biggest issue is that right now parsing type A = &B\n will put \n in the node tree before B. that's because we eagerly process all trivia so that the parser can assume no trivia exists, greatly simplifying it's job.

similarly, any comments will usually get attached to the last open node, but that is only really correct if the comment hangs at the end of a line. in all other cases, it makes more sense to attach the comment to the first node after it.

[linear]

MET-19 doc comments