mixin module template -> undefined identifier

[Robert Schadek]

I have some found some irregular behavior when using mixins with
template and modules. If a aggregation is defined in the same module it
is found. If the aggregation is defined in another module it fails. And
I wonder if this is be design. For comparison see the code below.

// file: moduleA.d

module A;

public int func(T)() {
    return mixin(T.stringof ~ ".fun()");
}

struct Bar {
    static int fun() {
        return 2;
    }
}

unittest {
    static assert(func!Bar() == 2);
}


// file: moduleB.d

import A;

struct Foo {
    static int fun() {
        return 1;
    }
}

void main() {
    assert(func!Foo() == 1);
}

dmd moduleA.d moduleB.d -ofmix -unittest
moduleA.d(4): Error: undefined identifier Foo
moduleB.d(10): Error: template instance A.func!(Foo) error instantiating