The following code will first cause the error "A function with the same name and parameters already exists", and then crash:

class Foo
{
	void a() {}
	void a() {}
}

class Bar : Foo
{
	void a() override {}
}

class FooBar : Bar
{
}

void Test()
{
	FooBar@ b = FooBar();
	b.a();
}

The empty FooBar class inheriting Bar is required, it doesn't crash without.

Thanks. I'll have it fixed before the release.

I've fixed this in revision 2575.