(diagnostic
  (schema slovo.diagnostic)
  (version 1)
  (severity error)
  (code UnsupportedGenericTypeAlias)
  (message "parameterized type aliases are reserved but not supported in the current beta")
  (file "<fixture>")
  (span
    (bytes 28 43)
    (range 4 13 4 28)
  )
  (expected "(type Alias ConcreteType)")
  (found "(type_params ...)")
  (hint "aliases remain transparent names for concrete supported target types")
)