找出标签联合体里的 bug

#include <stdio.h>

typedef enum { VALUE_COUNT, VALUE_RATIO } ValueKind;

typedef struct {
    ValueKind kind;
    union { int count; double ratio; } as;
} Value;

int main(void) {
    Value value = {VALUE_RATIO, {.ratio = 0.5}};
    value.kind = VALUE_COUNT;
    printf("%d\n", value.as.count);
    return 0;
}