(diagnostic
  (schema slovo.diagnostic)
  (version 1)
  (severity error)
  (code MalformedTypeAlias)
  (message "type alias form must be `(type Alias TargetType)`")
  (file "<fixture>")
  (span
    (bytes 16 28)
    (range 4 1 4 13)
  )
  (expected "(type Alias TargetType)")
)