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/* { dg-do preprocess }

   { dg-options "-fno-show-column" } */

#pragma GCC poison foo

foo                     /* { dg-error "foo" "use of foo" } */

#pragma GCC poison foo2 foo3

foo2                    /* { dg-error "foo2" "use of foo2" } */

foo3                    /* { dg-error "foo3" "use of foo3" } */

#pragma GCC poison      foo4    foo5

foo4                    /* { dg-error "foo4" "use of foo4" } */

foo5                    /* { dg-error "foo5" "use of foo5" } */

#pragma GCC poison +++  /* { dg-error "invalid" "poison non-identifier" } */

#define foo6 123

#pragma GCC poison foo6 /* { dg-warning "foo6" "poison defined macro" } */

#define foo6 345        /* { dg-error "foo6" "def of foo6" } */

#define foo6 456        /* { dg-error "foo6" "redef of foo6" } */

#ifdef foo6             /* { dg-error "foo6" "#ifdef foo6" } */

#error hey! foo6 defined!

#endif

#if defined(foo6)       /* { dg-error "foo6" "#if defined foo6" } */

#error foo6 still defined!

#else

foo6                    /* { dg-error "foo6" "use of foo6" } */

#endif

#pragma GCC poison