Lex + parse source in one shot, dropping all diagnostics. Convenience for
tests + the parse bin; production callers should construct their own
DiagnosticEngine.
Lex s and run the inline parser on it. Returns the inline Node
list (Text, InlineCode, Bold, Italic, Strikethrough, Link, …).
Used by table cells, which receive raw cell strings rather than
pre-tokenised inline content.