````
static const char *season[] = {
	[0] = "Winter",
	[1] = "Spring",
	[2] = "Summer",
	[3] = "Fall",
};

struct WTF {
	const char *season;
};

static const struct WTF wtf = { .season = season[2] };
````

mattst88@framework ~ % gcc -c t.c -o t.o
t.c:12:43: error: initializer element is not constant
   12 | static const struct WTF wtf = { .season = season[2] };
      |                                           ^~~~~~
t.c:12:43: note: (near initialization for ‘wtf.season’)