public override void OnMethodInvocationExpression(MethodInvocationExpression node)
{
if (BuiltinFunction.Switch != node.Target.Entity) return;
for (int i = 1; i < node.Arguments.Count; ++i)
{
ReferenceExpression label = (ReferenceExpression)node.Arguments[i];
_state.AddLabelReference(label);
}
}