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(meg/match ~(sequence (capture (some "smile") :x) (backref :x))
           "smile!")

captures and tags
captures: @["smile"]
tagged-captures:
  tags: @[:x]
  values: @["smile"]

current frame
status: exiting frame 1 with value: 5
peg: (capture (some "smile") :x)
text: smile!
index: 0 advanced to: 5
matched: smile

frames call stack
1 (capture (some "smile") :x)
0 (sequence (capture (some "smile") :x) (backref :x))