gistfile1.txt

$ cat Vagrantfile
require 'vagrant/util/deep_merge'

h = { hello: "bob" }

Vagrant.configure("2") do |config|
  p Vagrant::Util::DeepMerge.deep_merge(h, { hello: "world" })
end

$ vagrant status
{:hello=>"world"}
Current machine states:

default                   not created (virtualbox)

The environment has not yet been created. Run `vagrant up` to
create the environment. If a machine is not created, only the
default provider will be shown. So if a provider is not listed,
then the machine is not created for that environment.