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

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

current frame
status: exiting frame 4 with value: 3
peg: "abc"
text: abcdef
index: 0 advanced to: 3
matched: abc

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