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In file included from example.c:3:
./poison.h:12:21: warning: poisoning existing macro
#       pragma GCC poison strcpy wcscpy stpcpy wcpcpy
                          ^
./poison.h:12:35: warning: poisoning existing macro
#       pragma GCC poison strcpy wcscpy stpcpy wcpcpy
                                        ^
./poison.h:15:21: warning: poisoning existing macro
#       pragma GCC poison strcat wcscat
                          ^
./poison.h:17:21: warning: poisoning existing macro
#       pragma GCC poison sprintf vsprintf vfprintf
                          ^
./poison.h:17:29: warning: poisoning existing macro
#       pragma GCC poison sprintf vsprintf vfprintf
                                  ^
./poison.h:19:21: warning: poisoning existing macro
#       pragma GCC poison strncpy wcsncpy
                          ^
example.c:7:3: error: attempt to use a poisoned identifier
  strcpy(a,b);
  ^
6 warnings and 1 error generated.