Program: 83021
Project: 83021
Buggy source:
@Override public IValue checkAccess(MarkerList markers,ICodePosition position,IValue instance,IContext context){
  if (instance != null) {
    if ((this.modifiers & Modifiers.STATIC) != 0) {
      if (instance.valueTag() != IValue.CLASS_ACCESS) {
        markers.add(I18n.createMarker(position,"String_Node_Str",this.name.unqualified));
      }
 else       if (instance.getType().getTheClass() != this.theClass) {
        markers.add(I18n.createMarker(position,"String_Node_Str",this.name.unqualified,this.theClass.getFullName()));
      }
      instance=null;
    }
 else     if (instance.valueTag() == IValue.CLASS_ACCESS) {
      if (!instance.getType().getTheClass().isObject()) {
        markers.add(I18n.createMarker(position,"String_Node_Str",this.name.unqualified));
      }
    }
 else {
      IType type=this.theClass.getType();
      instance=IType.convertValue(instance,type,type,markers,context);
    }
  }
 else   if ((this.modifiers & Modifiers.STATIC) == 0) {
    if (context.isStatic()) {
      markers.add(I18n.createMarker(position,"String_Node_Str",this.name));
    }
 else {
      markers.add(I18n.createMarker(position,"String_Node_Str",this.name.unqualified));
      instance=new ThisValue(position,this.theClass.getType(),context,markers);
    }
  }
  if (this.hasModifier(Modifiers.DEPRECATED)) {
    Deprecation.checkDeprecation(markers,position,this,"String_Node_Str");
  }
switch (IContext.getVisibility(context,this)) {
case IContext.INTERNAL:
    markers.add(I18n.createMarker(position,"String_Node_Str",this.name));
  break;
case IContext.INVISIBLE:
markers.add(I18n.createMarker(position,"String_Node_Str",this.name));
break;
}
return instance;
}

Fixed version (ground truth):
@Override public IValue checkAccess(MarkerList markers,ICodePosition position,IValue instance,IContext context){
  if (instance != null) {
    if ((this.modifiers & Modifiers.STATIC) != 0) {
      if (instance.valueTag() != IValue.CLASS_ACCESS) {
        markers.add(I18n.createMarker(position,"String_Node_Str",this.name));
      }
 else       if (instance.getType().getTheClass() != this.theClass) {
        markers.add(I18n.createMarker(position,"String_Node_Str",this.name,this.theClass.getFullName()));
      }
      instance=null;
    }
 else     if (instance.valueTag() == IValue.CLASS_ACCESS) {
      if (!instance.getType().getTheClass().isObject()) {
        markers.add(I18n.createMarker(position,"String_Node_Str",this.name));
      }
    }
 else {
      IType type=this.theClass.getClassType();
      IValue instance1=IType.convertValue(instance,type,type,markers,context);
      if (instance1 == null) {
        Util.createTypeError(markers,instance,type,type,"String_Node_Str",this.name);
      }
 else {
        instance=instance1;
      }
    }
  }
 else   if ((this.modifiers & Modifiers.STATIC) == 0) {
    if (context.isStatic()) {
      markers.add(I18n.createMarker(position,"String_Node_Str",this.name));
    }
 else {
      markers.add(I18n.createMarker(position,"String_Node_Str",this.name.unqualified));
      instance=new ThisValue(position,this.theClass.getType(),context,markers);
    }
  }
  if (this.hasModifier(Modifiers.DEPRECATED)) {
    Deprecation.checkDeprecation(markers,position,this,"String_Node_Str");
  }
switch (IContext.getVisibility(context,this)) {
case IContext.INTERNAL:
    markers.add(I18n.createMarker(position,"String_Node_Str",this.name));
  break;
case IContext.INVISIBLE:
markers.add(I18n.createMarker(position,"String_Node_Str",this.name));
break;
}
return instance;
}