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

captures and tags
captures: @[5 "abc"]
tagged-captures:
  tags: @[:tag :tag]
  values: @[5 "abc"]

current frame
status: entered frame 5
peg: (backref :tag)
text: abc
index: 0

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