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/* { dg-do preprocess } */

/* Test source Robert Lipe, with minor modifications for the testsuite

   by Neil Booth.  29 Oct 2000.  */

#define _VA_ARGS_0() 42

#define _L_0()                      (

#define _R_0()                      )

#define __VA_ARGLIST(argc,list) \

                _VA_ARGS_##argc list

#define _CAT_LIST(argc,list1,list2) \

                _L_##argc list1 _R_##argc list2

#define _VA_ARGLIST(argc,list1,list2) \

                __VA_ARGLIST(argc, \

                        _CAT_LIST(argc, list1, list2))

#define BLAH(a) _VA_ARGLIST(a, (), ())

#if BLAH (0) != 42

#error Simulated varargs macros

#endif