Bug 22613 – Alias to template instantiation can act as the template itself

Example: ``` enum foo(int x) = x; alias bar = foo!1; pragma(msg, bar); // prints 1 pragma(msg, bar!2); // prints 2 ``` `bar` is an alias to instantiated template (an `int` value), yet surprisingly it can also act as the template itself, and be re-instantiated. I'd expect the expression `bar!2` to produce a compilation error.

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