Behat 3 imports

behat.yml

imports:
    - config/ctlt-events-config.yml
default:
    suites:
        default:
            contexts:
                - FeatureContext:
                    parameters: &parameters
                        test_key: test_value
                - Behat\MinkExtension\Context\MinkContext
    extensions:
        Behat\MinkExtension:
            base_url: http://ubceventslocal.dev
            goutte: ~
            browser_name: 'chrome'
            selenium2:
                wd_host: "http://127.0.0.1:4444/wd/hub"

ctlt-events-config.yml

default:
    suites:
        default:
            contexts:
                - FeatureContext:
                    parameters:
                        <<: *parameters
                        test_key: OVERRIDE

Results.txt

With the imports line at the top or the bottom, when I run behat, I get

```
[Symfony\Component\Yaml\Exception\ParseException]
Reference "parameters" does not exist at line 11 (near "\: *parameters").
```

If I remove `&parameter`s from behat.yml and `<<: *parameters` from config/ctlt-events-config.yml and put the imports
line at the top or the bottom, and then `var_dump( $parameters )` in the` __construct()` method then with both, the
value of `test_key` is always `test_value` and never `OVERRIDE`