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### Spirit V3.0.6 (Boost V1.73.0)

- ADL used to find and match `unused_type` streaming operators for every type in `boost::spirit::x3` namespace GH#553 GH#552
- Ceased dependence on Boost.TTI
- Rule placeholders now a non-trivial type because its copy constructor checks for a static initialization fiasco GH#571
- Most parsers are now constexpr-constructible GH#570