In C if I have
typedef struct
{
Token_type type;
Token_data data;
} Token_t;

typedef struct sitem {
char *key;
struct Token_t *token;
} item_t;

Why can't I do?

void insert(char *key, Token_t *data) {
item_t* new_item = malloc(sizeof (_item_t));
new_item->token = data;

}