(diagnostic
  (schema slovo.diagnostic)
  (version 1)
  (severity error)
  (code UnsupportedStringEscape)
  (message "string literal uses an unsupported escape")
  (file "<fixture>")
  (span
    (bytes 52 54)
    (range 5 18 5 20)
  )
  (expected "\\n, \\t, \\\", or \\\\")
  (found "\\0")
  (hint "the first string runtime slice supports only newline, tab, quote, and backslash escapes")
)