unittest under betterC

[DLearner]

Neither:
```
extern(C) int foo() {

    return 4;
}

unittest {

    assert(foo() != 4, "!= Assert triggered.");
    assert(foo() == 4, "== Assert triggered.");
}
```


Nor:
```
int foo() {

    return 4;
}

unittest {

    assert(foo() != 4, "!= Assert triggered.");
    assert(foo() == 4, "== Assert triggered.");
}
```

Triggers anything with:
```
dmd -betterC -main -unittest -i -run foo
```
Any ideas?