OpenSSL::Config#check_modify

# File tmp/rubies/ruby-3.0.5/ext/openssl/lib/openssl/config.rb, line 491
def check_modify
  warn "#{caller(2, 1)[0]}: warning: do not modify OpenSSL::Config; this " \
    "method is deprecated and will be removed in a future release."
  raise TypeError.new("Insecure: can't modify OpenSSL config") if frozen?
end