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

captures and tags
captures: @[]

current frame
status: entered frame 3
peg: "smile"
text: smile!
index: 0

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