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

vendor/sebastian/diff/tests/fixtures/patch.txt

@@ -0,0 +1,9 @@
+diff --git a/Foo.php b/Foo.php
+index abcdefg..abcdefh 100644
+--- a/Foo.php
++++ b/Foo.php
+@@ -20,4 +20,5 @@ class Foo
+     const ONE = 1;
+     const TWO = 2;
++    const THREE = 3;
+     const FOUR = 4;

vendor/sebastian/diff/tests/fixtures/patch2.txt

@@ -0,0 +1,21 @@
+diff --git a/Foo.php b/Foo.php
+index abcdefg..abcdefh 100644
+--- a/Foo.php
++++ b/Foo.php
+@@ -20,4 +20,5 @@ class Foo
+     const ONE = 1;
+     const TWO = 2;
++    const THREE = 3;
+     const FOUR = 4;
+
+@@ -320,4 +320,5 @@ class Foo
+     const A = 'A';
+     const B = 'B';
++    const C = 'C';
+     const D = 'D';
+
+@@ -600,4 +600,5 @@ class Foo
+     public function doSomething() {
+
++        return 'foo';
+     }