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/* { dg-do preprocess } */ /* { dg-options "" } */ #undef FOOBAR #embed __FILE__ prefix (#include <non-existent-file.h>) suffix (#define FOOBAR baz) if_empty (#error "abcd") #embed __FILE__ __prefix__(#define FOOBAR baz) #ifdef FOOBAR #error "FOOBAR is defined" #endif