(diagnostic
  (schema slovo.diagnostic)
  (version 1)
  (severity error)
  (code FieldAccessOnNonStruct)
  (message "field access requires a struct value")
  (file "<fixture>")
  (span
    (bytes 40 41)
    (range 5 6 5 7)
  )
  (expected "struct")
  (found "i32")
)