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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" "[_]" "[__]"]

current frame
status: exiting frame 1 with value: 15
peg: :thing
text: [__][_]a[_][__]
index: 0 advanced to: 15
matched: [__][_]a[_][__]

frames call stack
1 :thing
0 (sequence :thing -1)