var_typedef_declaration:	
	(type_def ?= 'typedef')? var = variable_declaration
;

function_prototype:
	var = variable_declaration
;

@Check
def validateModel(Model model)
{
		
	var ResourceSet newResSet = null;
	var LazyLinkingResource res = null;
	newResSet = new ResourceSetImpl();
	var ResourceSet curResSet = model.eResource.resourceSet;
				
	EcoreUtil2::clone(newResSet, curResSet);
	res = newResSet.resources.get(0) as LazyLinkingResource;

        ...

	var f_prop = EmbeddecyFactory.eINSTANCE.createfunction_prototype;
	res.allContents.toList.set(i, f_prop);  // doesn't work
}

res.contents.set(i, f_prop)  //contents may be directly modified. It works!