opCast problem with 2.060

[Namespace]

[code]
import std.conv : to;

class Vector2D(T) {
public:
    T x, y;
    this(T x, T y) {
        this.x = x;
        this.y = y;
    }

    U opCast(U)() const {
        return new U(x, y);
    }
}

alias Vector2D!(short) Vector2s;
alias Vector2D!(float) Vector2f;

void main() {
        Vector2s vs1 = new Vector2s(42, 23);
        Vector2s vs2 = new Vector2s(42, 23);

        assert(vs1 == vs2);
}
[/code]

prints:

dmd -w -O -property -unittest -debug -of"vec_test_2060" 
"vec_test_2060.d" (im Verzeichnis: D:\D\D_Scripts\Test 4)
vec_test_2060.d(13): Error: no constructor for Object
vec_test_2060.d(24): Error: template instance 
vec_test_2060.Vector2D!(short).Vector2D.opCast!(Object) error 
instantiating
Kompilierung fehlgeschlagen.


And this code:
[code]
import std.conv : to;

class Vector2D(T) {
public:
    T x, y;

    this(T x, T y) {
        this.x = x;
        this.y = y;
    }

    U opCast(U : inout(Vector2D!V), V)() const {
        return new U(x, y);
    }
}

alias Vector2D!(short) Vector2s;
alias Vector2D!(float) Vector2f;

void main() {
        Vector2s vs1 = new Vector2s(42, 23);
        Vector2s vs2 = new Vector2s(42, 23);

        assert(vs1 == vs2);
}
[/code]

prints:

dmd -w -O -property -unittest -debug -of"vec_test_2060" 
"vec_test_2060.d" (im Verzeichnis: D:\D\D_Scripts\Test 4)
vec_test_2060.d(24): Error: template instance opCast!(Object) 
opCast!(Object) does not match template declaration opCast(U : 
inout(Vector2D!(V)),V)
vec_test_2060.d(24): Error: function expected before (), not 
vs1.opCast!(Object) of type void
vec_test_2060.d(24): Error: template instance opCast!(Object) 
opCast!(Object) does not match template declaration opCast(U : 
inout(Vector2D!(V)),V)
vec_test_2060.d(24): Error: function expected before (), not 
vs2.opCast!(Object) of type void
Kompilierung fehlgeschlagen.

If i add to the last code this:

[code]
const(U) opCast(U = typeof(this))() const {
        return this;
}
[/code]

I get:

dmd -w -O -property -unittest -debug -of"vec_test_2060" 
"vec_test_2060.d" (im Verzeichnis: D:\D\D_Scripts\Test 4)
vec_test_2060.d(28): Error: cannot implicitly convert expression 
(vs1.opCast()) of type const(Object) to object.Object
vec_test_2060.d(28): Error: cannot implicitly convert expression 
(vs2.opCast()) of type const(Object) to object.Object
Kompilierung fehlgeschlagen.

With 2.059 both works fine. What is the problem now?