(diagnostic
  (schema slovo.diagnostic)
  (version 1)
  (severity error)
  (code MalformedOptionConstructor)
  (message "`some` constructor must be `(some i32 value)`")
  (file "<fixture>")
  (span
    (bytes 45 55)
    (range 5 3 5 13)
  )
  (hint "use `(some i32 value)`")
)