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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: entered frame 5
peg: (backref :x)
text: smile!
index: 5

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