Merge pull request #8051 from ravage84/unused-rule

Remove unused local variable

src/Composer/DependencyResolver/Problem.php

@@ -79,7 +79,6 @@ class Problem
             reset($reasons);
             $reason = current($reasons);
 
-            $rule = $reason['rule'];
             $job = $reason['job'];
 
             if (isset($job['constraint'])) {