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(meg/match ~(sequence (only-tags (sequence (capture 1 :a) (capture 2 :b))) (backref :a))
           "xyz")

captures and tags
captures: @["x" "yz"]
tagged-captures:
  tags: @[:a :b]
  values: @["x" "yz"]

current frame
status: exiting frame 5 with value: 3
peg: (capture 2 :b)
text: xyz
index: 1 advanced to: 3
matched: yz

frames call stack
5 (capture 2 :b)
2 (sequence (capture 1 :a) (capture 2 :b))
1 (only-tags (sequence (capture 1 :a) (capture 2 :b)))
0 (sequence (only-tags (sequence (capture 1 :a) (capture 2 :b))) (backref :a))