(diagnostic
  (schema slovo.diagnostic)
  (version 1)
  (severity error)
  (code TypeMismatch)
  (message "cannot call `first` with argument of wrong type")
  (file "<fixture>")
  (span
    (bytes 107 120)
    (range 8 10 8 23)
  )
  (expected "(array i32 2)")
  (found "(array i32 1)")
)