endless loop with ref and non-ref parameter

[Namespace]

In relation to this post:
http://forum.dlang.org/thread/hlyospppnjiziyokfvdd@forum.dlang.org?page=2#post-qxqvreqpniftjnwxvqgt:40forum.dlang.org

I dicided to test a bit with "manual" auto ref.
This Code works as expected.

[code]
import std.stdio;

struct A {
public:
	
}

void foo(A a) {
	writeln("without ref");
	foo(a);
}

void foo(ref A a) {
	writeln("with ref");
}

void main() {
	foo(A());
}
[/code]

it prints:
without ref
with ref

but if I change
ref A a
to
ref const A a

it turns into an endless loop.

My question is:
Is this behavior intended?
I know "const" is part of the type, but shouldn't recognize the
compiler this case?