#include <stdio.h>

enum node_type {LEAF, NODE};

struct node {
  enum node_type type;
};

int parse_tree( struct node* n ) {
    switch( n->type ) {
    case NODE: return 1;
    case LEAF: return 2;
    }  
}

int main() {
  struct node n;
  printf("%d", parse_tree(&n));
}