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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: @["[__]" "[_]" "a"]

tagged-captures:
  tags: @[:delim :delim nil]
  values: @["[__]" "[_]" "a"]

current frame

status: exiting frame 43 with value: 11

peg: (backmatch :delim)

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

index: 8 advanced to: 11

matched: [_]

frames call stack

43 (backmatch :delim)
42 (capture (backmatch :delim))
41 :close
17 (sequence :open :thing :close)
16 (unref (sequence :open :thing :close))
15 (choice (unref (sequence :open :thing :close)) (capture (any (if-not "[" 1))))
14 :thing
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)