(diagnostic
  (schema slovo.diagnostic)
  (version 1)
  (severity error)
  (code UnsupportedStructFieldType)
  (message "released struct fields support direct `i32`, `i64`, `f64`, `bool`, `string`, direct fixed arrays of those element families, direct enum fields, current concrete vec/option/result fields, and current non-recursive struct fields")
  (file "<fixture>")
  (span
    (bytes 35 39)
    (range 5 6 5 10)
  )
  (expected "direct `i32`, `i64`, `f64`, `bool`, `string`, direct fixed array of those element families, direct enum field, current concrete vec/option/result field, or current non-recursive struct field")
  (found "unit")
)