Designated Initializer Array in C

I'm trying to initialize an struct array using designated initializer:

A[size].from = {[0 ... size - 1] = 0};A[size].to = {[0 ... size - 1] = 0};

List.h:

typedef struct Buffer{    int from;    int to;}buffer_t;typedef struct shared_memory{buffer_t A;int size;} share_t

Main.c

#include <stdio.h>    #include "list.h"buffer_t A[];int size;void main(int argc, char *argv[]){    share->share_t *share = (share_t *)malloc(sizeof(share_t));    long arg = strtol(argv[1], NULL, 10);    size = arg;    share->A[size] = {[0 ... size-1] = 0};}

However this is the following error I'm receiving:

enter image description here

I'm using MinGW gcc and command prompt to compile this code and I'm writing this code in Visual studio.