LibSass: type confusion in Sass::ParserState::ParserState(Sass::ParserState const&)

I haven't actually spent much time on the bug, because it doesn't look super exploitable outside of a local DoS, but the attached PoC will crash sassc in the middle of libsass from latest git, trying to deref $0x8, which appears to be the value of some tag in a tagged union. Let me know if I can...