Why can't a struct be a member of itself?

Question

I have a struct foo. Declaring a member of type foo* works:

typedef struct foo
{
    struct foo* children[26];
} foo;

Answer 1

The structure Trie cannot contain another structure Trie in it , it will do a never - ending recursion but it may contain a pointer to another structure Trie

So first one is correct

typedef struct TRIE
{
    bool is_endpoint;
    bool is_initialized;
    struct TRIE* children[26];
} TRIE;