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

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

current frame
status: exiting frame 5 with value: 5
peg: (backref :x)
text: smile!
index: 5
matched: 

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