fabpot/gist:43fda1b7d76f666f8a38

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    2.7.1 blockers

To be merged or rejected:

symfony/symfony#14900 Fixing Deprecation Warnings
symfony/symfony#14887 Swap new ChoiceView constructor arguments to ease migrating from the deprecated one
symfony/symfony#14883 Improved exception message if custom implementation of OptionsResolverInterface is used
symfony/symfony#14835 [DependencyInjection] Fixed resolving of service configurators containing Definition objects
symfony/symfony#14825 Documenting how to keep option value BC
symfony/symfony#14816 [TwigBridge] Make AppVariable check if security.context exists
symfony/symfony#14786 [Validator] Ensure nested validations for Collections happen in a separate context

Interesting but not vital:

symfony/symfony#14886 [Routing] improved message for deprecated requirements