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union u { struct {unsigned h, l;} i; double d; }; foo (union u x) { while (x.i.h++) { while (x.i.l-- > 0) ; while (x.d++ > 0) ; } } union n { long long unsigned i; double d; }; bar (union n x) { int i; for (i = 0; i < 100; i++) { while (--x.i > 0) ; while (++x.d > 0) ; } return x.i; }