[Issue 16662] Can't call std.variant.visit from a pure function

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=16662

--- Comment #2 from Илья Ярошенко <ilyayaroshenko at gmail.com> ---
Variant's "get" method is not pure too. It was a big surprise. No I need to
figure out how to deal with it, the whole big project is pure.

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