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(meg/match ~(sequence (constant 5 :tag) (sub (capture "abc" :tag) (backref :tag)))
           "abcdef")

captures and tags
captures: @[]

current frame
status: entered frame 1
peg: (constant 5 :tag)
text: abcdef
index: 0

frames call stack
1 (constant 5 :tag)
0 (sequence (constant 5 :tag) (sub (capture "abc" :tag) (backref :tag)))