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struct Foo { int *p; int *q; }; void __attribute__((noinline)) bar (int **x) { struct Foo *f = (struct Foo *)(x - 1); *(f->p) = 0; } int foo(void) { struct Foo f; int i = 1, j = 2; f.p = &i; f.q = &j; bar(&f.q); return i; } extern void abort (void); int main() { if (foo () != 0) abort (); return 0; }