variant does not support a class derived from variant as one of its types

[Tobias Reh <treh@…>]

variant does not support a class derived from variant as one of its types. See the following example code:

struct A {};
struct B {};
struct C {};

struct AB : boost::variant<A, B> {};

using AB_C = boost::variant<AB, C>;

void foo() {
    AB ab;
    AB_C ab_c{ab}; // member function convert_construct is abiguous
}

[Antony Polukhin]

Fixed in ​d23cdd35 develop, will be merged to master branch as soon as the tests will cycle.