template <typename T> struct x; template <typename T> constexpr int y = x::a; // Clang diagnostic doesn't mention that `x` is a template. using z = x; // Clang diagnostic mentions that `x` is a template.
In the definition of y, Clang complains that x isn't a "class, namespace, or enumeration", but fails to mention that it is a class template and no template parameters have been provided.
In other simpler contexts, such as the definition of the using alias y, Clang does explain that x is a class template and template parameters need to be provided.
We should improve the quality of the diagnostic for the y case - it should explain that x is a class template and template parameters are missing.
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