template mixin bug?

[Simen Haugen]

I have a mixin like this:
template M() {
 int i() {
  return _i;
 }

 private:
 int _i;
}

But if I try to add a setter function to my class that uses the mixin, the 
compiler gets confused (seems like its hiding the mixed in function):
class C {
 mixin Mixin;
 void i(int a) {
  _i = a;
 }
}

void main() {
 C c = new C;
 c.i = 12;
 assert(c.i == 12);
}

Now it fails to compile if I try to use the get method from the mixin. If I 
don't use the method, it compiles.

t.d(29): function test.C.i (int) does not match parameter types ()
t.d(29): Error: expected 1 arguments, not 0
t.d(29): Error: void has no value
t.d(29): Error: incompatible types for (((c.i)()) == (12)): 'void' and 'int'

Is there a reason I cannot do this, or is it a compiler bug? I'm using dmd 
1.023.