```ruby
scope(env: 'dev', component: 'vpc') do
  stack('dev', 'eu-west-1', 'vpc') do
    inc { 'vpc.rb' }
  end
end
```

Test use of scope yield
user
```ruby
scope(env: "dev", component: "vpc") do |s|
  stack(s[:env], :'eu-west-1', :vpc) do
    inc { 'vpc.rb' }
  end
end
```
assistant