extension PureYAML.Parsing {
    /// Faithful Swift port of libyaml's scanner (`CYaml/src/scanner.c`). It is
    /// built as a parallel implementation, verified token-for-token against
    /// libyaml through the differential harness, to replace the hand-rolled
    /// approximation whose indentation and simple-key handling the official test
    /// suite surfaced as incorrect. The port proceeds function by function; each
    /// piece mirrors its C counterpart so correctness is by construction rather
    /// than re-derived. Members live under this namespace in their own files.
    enum LibYAML {}
}