private void handleCommaSplitMixinReferenceArguments(HiddenTokenAwareTree token, MixinReference reference) {
List<HiddenTokenAwareTree> children = token.getChildren();
for (HiddenTokenAwareTree kid : children) {
ASTCssNode parameter = parentBuilder.switchOn(kid);
if (parameter.getType() == ASTCssNodeType.VARIABLE_DECLARATION) {
VariableDeclaration variableDeclaration = (VariableDeclaration) parameter;
Iterator<Expression> expressions = variableDeclaration.getValue().splitByComma().iterator();
variableDeclaration.setValue(expressions.next());
reference.addNamedParameter(variableDeclaration);
addAsPositional(reference, expressions);
} else {
Iterator<Expression> expressions = ((Expression) parameter).splitByComma().iterator();