The aliases `self` and `parent` are both declared by aliasing the function by name. For overloaded functions this means the overloads is aliased, not the exact function being implemented. This is not a problem when just calling `self` or `parent`, but for reflection purposes it is.

The following should work, but doesn't:

----------
import std.typecons : AutoImplement;

interface A
{
	void overloaded(int);
	void overloaded(float);
}

enum tpl(C, alias fun) = q{
	import std.traits : Parameters;
	static assert(is(Parameters!self == typeof(args)));
};

alias Impl = AutoImplement!(A, tpl);
----------

Output:

$ dmd -o- -c autoimplement.d
/Library/D/dmd/src/phobos/std/typecons.d-mixin-4495(4510): Error: static assert:  is((int) == (float)) is false
autoimplement.d(14):        instantiated from here: AutoImplement!(A, tpl, isAbstractFunction)