if (argumentCv == null) continue;
	private void doVisitMethodInvocationArguments(IMethodBinding methodBinding, ITypeBinding[] parameterTypes, List arguments) {		for (int i= 0; i < parameterTypes.length; i++) {			ITypeBinding parameterTypeBinding= parameterTypes[i];			if (! fTCModel.isACollectionType(parameterTypeBinding))				continue;			ParameterTypeVariable2 parameterTypeCv= fTCModel.makeParameterTypeVariable(methodBinding, i);			ConstraintVariable2 argumentCv= getConstraintVariable((ASTNode) arguments.get(i));			CollectionElementVariable2 parameterElementCv= fTCModel.makeElementVariable(parameterTypeCv);			CollectionElementVariable2 argumentElementCv= fTCModel.getElementVariable(argumentCv);			// Elem[param] =^= Elem[arg]			fTCModel.createEqualsConstraint(parameterElementCv, argumentElementCv);		}	}