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/* { dg-do run } */

/* { dg-options "-O2" } */

extern "C" void abort(void);

struct T1 {int a, b; virtual void f(){}};

struct T : T1 { struct T1 w;  int b; };

void foo (struct T1 *p) { struct T *q = dynamic_cast(p); if (q->b != 2) abort (); }

/* We shouldn't kill the store to c.b, because foo uses it.  */

int main () { struct T c; c.b = 2; foo (&c); return 0; }