Heads up: variant test breakage

As a general heads up, noticed this report on the boost mailing list

http://boost.2283326.n4.nabble.com/variant-spirit-broken-tc4686757.html

Allegedly a change to Boost Variant broke some tests in Spirit. I
haven't looked into it (I don't even know how to run the tests easily).
Perhaps someone else can spot whether the breakage is indeed a problem
with Boost Variant (it might fall within documented behaviour of Boost
Variant?)

Cheers,
Seth Heeren

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