E2405 Dependent template reference 'identifier' yields non-template symbol (C++)
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If a template specialization reference within a template declaration yields a reference to a non-template during type instantiation, the above error will result. For example:
template<class T> class foo { typename T::template A<int> x; // "A" must be a member template }; struct bar { struct A { }; }; foo<bar> y;// error: bar::A is a non-template class!