Bug 21391 – deprecated doesn't work for mixin templates

Minimal test case (1 deprecation expected): ``` void main(string[] args) {} mixin Test!("hello", 42); deprecated mixin template Test(Args...){ int b; } ``` Complex test case. No deprecation messages occur (2 expected) ``` // Check for local and static template mixins void main(string[] args) { mixin Test!("hello", 42); mixin Test!(Foo()); // deprecated expected mixin Test!(50.0, 42); a = b + c + .a + .b + .c; } mixin Test!("hello", 42); mixin Test!(Foo()); // deprecated expected mixin Test!(50.0, 42); struct Foo {} // 3 overloads, so any ordering works mixin template Test(double num, Args...){ int a; } deprecated mixin template Test(Args...){ int b; } mixin template Test(string str, Args...){ int c; } ``` No deprecation messages are issued by the compiler here.

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