(diagnostic
  (schema slovo.diagnostic)
  (version 1)
  (severity error)
  (code UnsupportedOptionPayloadType)
  (message "first-pass options support only `i32`, `i64`, `u32`, `u64`, `f64`, `bool`, and `string` payloads")
  (file "<fixture>")
  (span
    (bytes 52 61)
    (range 5 18 5 27)
  )
  (expected "i32, i64, u32, u64, f64, bool, or string")
  (found "(vec i32)")
)