pub fn always_fail(_buf: &mut [u8]) -> Result<(), Error>Expand description
Custom getrandom() handler that always returns an error.
getrandom is a commonly used package for sourcing randomness.This should return an error for now,
but in the future it might make sense for the validators to determinstically source randomness from
BABE (eg. at a certain block)
From https://docs.rs/getrandom/latest/getrandom/macro.register_custom_getrandom.html