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

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

current frame
status: exiting frame 7 with value: 3
peg: (backref :a)
text: xyz
index: 3
matched: 

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