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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: entered frame 5
peg: (backmatch)
text: aba
index: 2

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