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struct A; struct B { struct A *pA; }; struct C; struct E { struct A **pA; struct C *pC; }; void f(struct E *pE, struct B *pB) { pB->pA = pE->pA[0]; } static const struct { int x; } foo[] = {{ 1 }}; struct C { int bar[(sizeof foo/sizeof foo[0])]; };