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Our previous implementation only allowed for a single layer of capture groups. Now we can have captures within captures. I achieved this by converting the match into a tree before generating tokens. If there are any capture scopes specified, then we will always emit a token for every capture group in the match. This may create some redundant tokens (a serious of 2 or more tokens with the same scopes), but it will at least be technically correct. I think the overhead of removing these redundancies exceeds the cost of maintaining them for now.