Node block = iter.getBlockVarNode();
boolean hasBlock = block != null;
if (varNode == null || varNode instanceof ZeroArgNode) { // No argument blocks
noargblock = !hasBlock;
assigner = hasBlock ? new Pre0Rest0Post0BlockAssigner(block) :
new Pre0Rest0Post0Assigner();
} else if (varNode instanceof MultipleAsgnNode) {
MultipleAsgnNode masgn = (MultipleAsgnNode) varNode;
int preCount = masgn.getPreCount();
boolean isRest = masgn.getRest() != null;
Node rest = masgn.getRest();
ListNode pre = masgn.getPre();
noargblock = false;
switch(preCount) {
case 0: // Not sure if this is actually possible, but better safe than sorry
if (isRest) {
assigner = hasBlock ? new Pre0Rest1Post0BlockAssigner(rest, block) :
new Pre0Rest1Post0Assigner(rest);
} else if (hasBlock) {
assigner = new Pre0Rest0Post0BlockAssigner(block);
} else {
noargblock = true;
assigner = new Pre0Rest0Post0Assigner();
}
break;