Can I ‘extend’ a struct in C?

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Evidently this feature has been added to C11, but alas I don’t have access to a C compiler of recent vintage (>= GCC 4.6.2).

typedef struct foo {
  int a;
} foo;

typedef struct bar {
  struct foo;
  int b;
} bar;

int main() {
  bar b;
  b.a = 42;
  b.b = 99;
  return 0;
}

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