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

captures and tags
captures: @[]

current frame
status: entered frame 0
peg: (sequence (capture (some "smile") :x) (backref :x))
text: smile!
index: 0

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