formatting and fix bug

src/Illuminate/Database/Eloquent/Builder.php

@@ -1375,21 +1375,7 @@ public static function __callStatic($method, $parameters)
         }
 
         if ($method === 'mixin') {
-            $mixin = $parameters[0];
-            $replace = $parameters[1] ?? true;
-
-            $methods = (new ReflectionClass($mixin))->getMethods(
-                ReflectionMethod::IS_PUBLIC | ReflectionMethod::IS_PROTECTED
-            );
-
-            foreach ($methods as $method) {
-                if ($replace || ! static::hasMacro($method->name)) {
-                    $method->setAccessible(true);
-                    static::macro($method->name, $method->invoke($mixin));
-                }
-            }
-
-            return;
+            return static::registerMixin($parameters[0], $parameters[1] ?? true);
         }
 
         if (! static::hasGlobalMacro($method)) {
@@ -1403,6 +1389,28 @@ public static function __callStatic($method, $parameters)
         return call_user_func_array(static::$macros[$method], $parameters);
     }
 
+    /**
+     * Register the given mixin with the builder.
+     *
+     * @param  string  $mixin
+     * @param  bool  $replace
+     * @return void
+     */
+    protected static function registerMixin($mixin, $replace)
+    {
+            $methods = (new ReflectionClass($mixin))->getMethods(
+                ReflectionMethod::IS_PUBLIC | ReflectionMethod::IS_PROTECTED
+            );
+
+            foreach ($methods as $method) {
+                if ($replace || ! static::hasGlobalMacro($method->name)) {
+                    $method->setAccessible(true);
+
+                    static::macro($method->name, $method->invoke($mixin));
+                }
+            }
+    }
+
     /**
      * Force a clone of the underlying query builder when cloning.
      *