Introduce ability to override default error view paths

src/Illuminate/Foundation/Configuration/Exceptions.php

@@ -29,6 +29,17 @@ public function report(callable $using)
         return $this->handler->reportable($using);
     }
 
+    /**
+     * Register error view paths callback.
+     *
+     * @param  callable  $using
+     * @return void
+     */
+    public function registerErrorViewPathsUsing(callable $using)
+    {
+        $this->handler->registerErrorViewPathsUsing($using);
+    }
+
     /**
      * Register a reportable callback.
      *

src/Illuminate/Foundation/Exceptions/Handler.php

@@ -116,6 +116,13 @@ class Handler implements ExceptionHandlerContract
      */
     protected $finalizeResponseCallback;
 
+    /**
+     * The callback that should be used to register the application's error view paths.
+     *
+     * @var callable|null
+     */
+    protected $registerErrorViewPathsUsing;
+
     /**
      * The registered exception mappings.
      *
@@ -233,6 +240,17 @@ public function renderable(callable $renderUsing)
         return $this;
     }
 
+    /**
+     * Register error view paths callback.
+     *
+     * @param  callable  $using
+     * @return void
+     */
+    public function registerErrorViewPathsUsing(callable $using)
+    {
+        $this->registerErrorViewPathsUsing = $using;
+    }
+
     /**
      * Register a new exception mapping.
      *
@@ -897,6 +915,11 @@ protected function renderHttpException(HttpExceptionInterface $e)
      */
     protected function registerErrorViewPaths()
     {
+        if (! is_null($this->registerErrorViewPathsUsing)) {
+            call_user_func($this->registerErrorViewPathsUsing);
+
+            return;
+        }
         (new RegisterErrorViewPaths)();
     }