Stack overflow for cyclic error library extension

[joeseibel]

Typing this model in the editor results in a stack overflow:

package MyEL
public
  annex EMV2 {**
    error types extends MyEL with
      t: type extends ErrorLibrary::AboveRange;
    end types;
  **};
end MyEL;

The problem is in ErrorModelUtil.getAllErrorTypes and ErrorModelUtil.getAllTypesets