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(meg/match ~(sequence (capture "a") "b" (capture (backmatch)))
           "aba")

captures and tags
captures: @[]

current frame
status: entered frame 1
peg: (capture "a")
text: aba
index: 0

frames call stack
1 (capture "a")
0 (sequence (capture "a") "b" (capture (backmatch)))