(diagnostic
  (schema slovo.diagnostic)
  (version 1)
  (severity error)
  (code DuplicateMatchArm)
  (message "duplicate `Color.Red` match arm")
  (file "<fixture>")
  (span
    (bytes 104 115)
    (range 9 6 9 17)
  )
  (related
    (span
      (file "<fixture>")
      (bytes 84 95)
      (range 8 6 8 17)
      (message "original match arm")
    )
  )
)