Compiler Error C2903

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'identifier' : symbol is neither a class template nor a function template

Code attempts explicit instantiation of something that is not a template.

The following sample generates C2903:

// C2903.cpp
// compile with: /c
namespace N {
   template<class T> class X {};
   class Y {};
}
void g() {
   N::template Y y;   // C2903
   N::X<N::Y> y;   // OK
}

C2903 can also occur when using generics:

// C2903b.cpp
// compile with: /clr /c
namespace N {
   class Y {};
   generic<class T> ref class Z {};
}

void f() {
   N::generic Y y;   // C2903
   N:: generic Z<int>^ z;   // OK
}