#include <stdio.h>
#include <string.h>
 
#define node(key_t, value_t)    \
    typedef struct node {       \
        key_t key;              \
        value_t value;          \
    } node
 
int main(int argc, const char * argv[]) {
    node(char*, int);
    node* n = malloc(sizeof(node*));
    n->key = "first";
    n->value = 1;
 
    printf("the node n has a key of %s and a value of %d.\n", n->key, n->value);
 
    // error starts from here
    node(char, char*);
    node* n2 = malloc(sizeof(node*));
    n2->key = 'a';
    n2->value = "first";
 
    printf("the node n2 has a key of %c and value of %s.\n", n2->key, n2->value);
 
    return 0;
}

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