E2408 Default values may be specified only in primary class template declarations (C++)

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Template functions, and class partial specializations, may not use default expressions in their template parameter lists. Only primary template declarations may do this. For example:

template<class T = int>
class foo;// OK: primary class template
template<class T = int>
void bar();// error: template function
template<class T = int>
class foo<T *>;// error: partial specialization