possible mixin template bug?

[growler]

This compiles and runs but I think it is a bug.
---
import std.stdio;
mixin template TestMixin(T) {
     int testMixin;
}
struct Test {
     int testMixin;
     mixin TestMixin!Test;
}
void main() {
     Test t;
     t.testMixin = 10;
     writefln("%s", t);
}
---
$ ./hack
Test(10, 0)

I can also change the struct to be:
---
struct Test {
    string testMixin;
    mixin TestMixin!Test;
}
// and the assignment in main() to
t.testMixin = "some string";
---
$ ./hack
Test("some string", 0)

so whether this is a bug or not, I think it is bad. Any thoughts?

G.