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struct foo { unsigned half:16; unsigned long whole:32 __attribute__ ((packed)); }; f (struct foo *q) { if (q->half != 0x1234) abort (); if (q->whole != 0x56789abcL) abort (); } main () { struct foo bar; bar.half = 0x1234; bar.whole = 0x56789abcL; f (&bar); exit (0); }