boost::variant usage with boost::spirit broken in 1.68 but ok in 1.60?

Hi together,

We are currently trying to upgrade our boost version from 1.60 to 1.68. With the new version, we noticed that our boost spirit code fails to compile. After some digging, I found this reported issue https://github.com/boostorg/spirit/issues/321 .
In fact it turns out, that this little reproducer shows the exact same compile time error we see, when we use boost 1.68.  But we don't see it with 1.60.

Does anyone have a clue why this worked with 1.60 but doesn't with 1.68. The change log between 1.60 and 1.68 doesn't show much related? Or does anyone know a quick workaround?
This issue currently blocks our attempt to upgrade boost in our company. And rewriting our parser without boost::variant is way too expensive.

Mit freundlichen Grüßen / Best Regards / Cordialement,

Hermann SCHNEIDER




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