Use an indexed for loop to avoid defining an unused variable.

src/main/java/org/junit/internal/runners/ErrorReportingRunner.java

@@ -37,7 +37,7 @@ public ErrorReportingRunner(Throwable cause, Class<?>... testClasses) {
     @Override
     public Description getDescription() {
         Description description = Description.createSuiteDescription(classNames);
-        for (Throwable each : causes) {
+        for (int i = 0; i < causes.size(); i++) {
             description.addChild(describeCause());
         }
         return description;