in src/nc_message.c [900:911]
bool msg_set_placeholder_key(struct msg *r)
{
struct keypos *kpos;
ASSERT(array_n(r->keys) == 0);
kpos = array_push(r->keys);
if (kpos == NULL) {
return false;
}
kpos->start = (uint8_t *)"placeholder";
kpos->end = kpos->start + sizeof("placeholder") - 1;
return true;
}