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`parse_token_tree` is basically a match with four arms: `Eof`, `OpenDelim`, `CloseDelim`, and "other". It has two call sites, and at each call site one of the arms is unreachable. It's also not inlined. This commit removes `parse_token_tree` by splitting it into four functions and inlining them. This avoids some repeated conditional tests and also some non-inlined function calls on the hot path.