[cfe-dev] Compatibility of Objective-C interface and id types

[Daniel Dunbar]

Currently mergeTypes has the following code/comment:
--
  case Type::ObjCInterface:
  {
    // Distinct ObjC interfaces are not compatible; see
canAssignObjCInterfaces
    // for checking assignment/comparison safety
    return QualType();
  }
--

It isn't clear to me why we shouldn't be merging interface types which are
in an
inheritance relation to one another here. It seems like it was explicitly
avoided,
given the presence of canAssignObjCInterfaces but I don't see the reason
yet.

Wouldn't merging the interface allow simplifying and maybe removing
canAssignObjCInterfaces?

 - Daniel
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