2015 – Interface template methods are allowed

Compiler allows the following:
--
class X
{
 void f(T)() { }
}
void main() { (new X).f!(int)(); }
--
This is due (at least partially) to the use of toParent() instead of toParent2() to in FuncDeclaration::semantic, FuncDeclaration::isVirtual, and Dsymbol::isMember.

Maybe add the implementation hint to bug 566 as well.
*** This bug has been marked as a duplicate of 566 ***

This actually came from a SourceForge bug report. The original specifies interface methods. In this case, the code fails to link, but there should be a proper error message.
----
interface TestInterface 
 { void tpl(T)(); }
class TestImplementation : TestInterface 
 { void tpl(T)() { } }
void main()
{
 /* TestImplementation t = new TestImplementation(); // works */
 TestInterface t = new TestImplementation(); // fails
 t.tpl!(int)();
}
---

Oops, didn't realize 566 was still open.
*** This bug has been marked as a duplicate of 566 ***