[cs] issues with Dynamic type parameters on interfaces

[nadako]

interface I<T> {
	function f():I<T>;
}

class C implements I<Any> {
	public function f():I<Any> return null;
}

class C2 implements I<Dynamic> {
	public function f():I<Dynamic> return null;
}

---

C gives this native compilation error:

error CS0539: 'global::I<...>.f' in explicit interface declaration is not a member of interface

because it generates

global::I global::I<object>.f() {

while I<object>.f is required to return I<object>, not I

---

and C2 gives this:

error CS0738: 'C2' does not implement interface member 'I<object>.f()'. 'C2.f()' cannot implement 'I<object>.f()' because it does not have the matching return type of 'I<object>'

which is a similar error (using I instead of I<object>), just the f is not using explicit interface implementation, so the error message is different.

---

What I don't quite understand yet is why generated code for Dynamic is different from Any, but I guess it's related to Dynamic variance?

I'm not hopeful, but maybe @waneck has some time to look into this? :)

[nadako]

(this is NOT a regression - same result on 3.4.7)

[kLabz]

Note: works fine if I is @:nativeGen