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(meg/match ~{:close (capture (backmatch :delim)) :main (sequence :thing -1) :open (capture (sequence "[" (some "_") "]") :delim) :thing (choice (unref (sequence :open :thing :close)) (capture (any (if-not "[" 1))))}
           "[__][_]a[_][__]")

captures and tags

captures: @[]

current frame

status: entered frame 12

peg: "_"

text: [__][_]a[_][__]

index: 3

frames call stack

12 "_"
9 (some "_")
7 (sequence "[" (some "_") "]")
6 (capture (sequence "[" (some "_") "]") :delim)
5 :open
4 (sequence :open :thing :close)
3 (unref (sequence :open :thing :close))
2 (choice (unref (sequence :open :thing :close)) (capture (any (if-not "[" 1))))
1 :thing
0 (sequence :thing -1)