Type mismatch: cannot convert from...

Hi,

Currently on 4.40M2 I have an issue with the following code:
```
public static void main(String[] args) throws Exception {
Stream.of(MyInterface.class.getName()).map(className -> {
try {
return Class.forName(className).asSubclass(MyInterface.class);
} catch (Exception e) {
throw new RuntimeException(e);
}
});
}

interface MyInterface {
}
```

It fails with:
Type mismatch: cannot convert from Class to Class Test2.java /test2/src/test line 13 Java Problem

Code compiles OK with javac

Not entirely sure whether it's a regression or not, because the code is new on our base code and I did not try it with previous eclipse versions