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(meg/match ~(sequence (only-tags (sequence (capture 1 :a) (capture 2 :b))) (backref :a))
           "xyz")

captures and tags
captures: @[]

current frame
status: entered frame 1
peg: (only-tags (sequence (capture 1 :a) (capture 2 :b)))
text: xyz
index: 0

frames call stack
1 (only-tags (sequence (capture 1 :a) (capture 2 :b)))
0 (sequence (only-tags (sequence (capture 1 :a) (capture 2 :b))) (backref :a))