using namespace a::b; does not work in a lambda defined on the root level. by Bengt Gustafsson

This is a really odd one. Of course I had to write the strange code to encounter it ;-).

If you place a using directive of a nested namespace in a lambda defined on the root level the compiler gets serious hickups... The commented out code below are versions which do work, so the bug really needs several prerequisites:

namespace fopp {
    namespace fupp {
    }
};

/*
int x()
{
    using namespace fopp::fupp;
}


int y()
{
    auto ttt = [&]()->int { using namespace fopp::fupp; };
}

auto tt = [&]()->int { using namespace fopp; using namespace fupp; };
*/

auto ttt = [&]()->int { using namespace fopp::fupp; };