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(meg/match ~(sequence (capture "a") "b" (capture (backmatch)))
           "aba")

captures and tags
captures: @["a"]
tagged-captures:
  tags: @[nil]
  values: @["a"]

current frame
status: exiting frame 1 with value: 1
peg: (capture "a")
text: aba
index: 0 advanced to: 1
matched: a

frames call stack
1 (capture "a")
0 (sequence (capture "a") "b" (capture (backmatch)))