sk_X509_EXTENSION_push
if (!sk_X509_EXTENSION_push(exts2, ext))
&& !sk_X509_EXTENSION_push(exts, ex))
if (!sk_X509_EXTENSION_push(tmpl->extensions, ext))
if (!sk_X509_EXTENSION_push(ret, ext))
|| !TEST_true(sk_X509_EXTENSION_push(exts, ext))