missing type system causes: complex assigns using part/property reference are not directly supported

```
assignments like: 
  c = a.somePart + b;
are currently not supported.

They can be simulated like:
  a' = a.somePart;
  c  = a' + b;


```

Original issue reported on code.google.com by `mc.bisc...@googlemail.com` on 10 Dec 2008 at 10:36
