Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/sebastian/recursion-context/composer.json

@@ -0,0 +1,36 @@
+{
+    "name": "sebastian/recursion-context",
+    "description": "Provides functionality to recursively process PHP variables",
+    "homepage": "http://www.github.com/sebastianbergmann/recursion-context",
+    "license": "BSD-3-Clause",
+    "authors": [
+        {
+            "name": "Sebastian Bergmann",
+            "email": "sebastian@phpunit.de"
+        },
+        {
+            "name": "Jeff Welch",
+            "email": "whatthejeff@gmail.com"
+        },
+        {
+            "name": "Adam Harvey",
+            "email": "aharvey@php.net"
+        }
+    ],
+    "require": {
+        "php": ">=5.3.3"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "~4.4"
+    },
+    "autoload": {
+        "classmap": [
+            "src/"
+        ]
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "1.0.x-dev"
+        }
+    }
+}