(diagnostic
  (schema slovo.diagnostic)
  (version 1)
  (severity error)
  (code DuplicateLocal)
  (message "duplicate local declaration `x`")
  (file "<fixture>")
  (span
    (bytes 58 59)
    (range 6 8 6 9)
  )
  (related
    (span
      (file "<fixture>")
      (bytes 42 43)
      (range 5 8 5 9)
      (message "original local declaration")
    )
  )
)