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struct A { int a; A (int aa): a (aa) {} }; struct B: public A { int b; B (int aa, int bb): A (aa), b(bb) {} }; int main (int argc, char **argv) { A *a = new B(42, 1729); B *b = (B *) a; return 0; /* breakpoint spot: casts.exp: 1 */ }