(diagnostic
  (schema slovo.diagnostic)
  (version 1)
  (severity error)
  (code DuplicateTypeAlias)
  (message "duplicate type alias `Count`")
  (file "<fixture>")
  (span
    (bytes 39 44)
    (range 5 7 5 12)
  )
  (related
    (span
      (file "<fixture>")
      (bytes 22 27)
      (range 4 7 4 12)
      (message "original type alias")
    )
  )
)