(diagnostic
  (schema slovo.diagnostic)
  (version 1)
  (severity error)
  (code TypeMismatch)
  (message "cannot assign value of wrong type to `x`")
  (file "<fixture>")
  (span
    (bytes 60 64)
    (range 6 10 6 14)
  )
  (expected "i32")
  (found "bool")
)