__warn_references
__warn_references(EVP_CipherFinal,
__warn_references(EVP_EncryptFinal,
__warn_references(EVP_DecryptFinal,
__warn_references(gets, "warning: this program uses gets(), which is unsafe.");
__warn_references(mktemp,
__warn_references(tempnam,
__warn_references(tmpnam,
__warn_references(x, # x " has lower than advertised precision");