LaravelはAssertionErrorを直接あつかうことができない。

$app->get('/assert', function(){
    assert(false);
});

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <[email protected]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Debug\Exception;

/**
 * Fatal Throwable Error.
 *
 * @author Nicolas Grekas <[email protected]>
 */
class FatalThrowableError extends FatalErrorException
{
    public function __construct(\Throwable $e)
    {
        if ($e instanceof \ParseError) {
            $message = 'Parse error: '.$e->getMessage();
            $severity = E_PARSE;
        } elseif ($e instanceof \TypeError) {
            $message = 'Type error: '.$e->getMessage();
            $severity = E_RECOVERABLE_ERROR;
        } else {
            $message = $e->getMessage();
            $severity = E_ERROR;
        }

        \ErrorException::__construct(
            $message,
            $e->getCode(),
            $severity,
            $e->getFile(),
            $e->getLine()
        );

        $this->setTrace($e->getTrace());
    }
}

/**
 * This extended pipeline catches any exceptions that occur during each slice.
 *
 * The exceptions are converted to HTTP responses for proper middleware handling.
 */
class Pipeline extends BasePipeline
{
(snip)
    /**
     * Get the initial slice to begin the stack call.
     *
     * @param  \Closure  $destination
     * @return \Closure
     */
    protected function prepareDestination(BaseClosure $destination)
    {
        return function ($passable) use ($destination) {
            try {
                return call_user_func($destination, $passable);
            } catch (Exception $e) {
                return $this->handleException($passable, $e);
            } catch (Throwable $e) {
                return $this->handleException($passable, new FatalThrowableError($e));
            }
        };
    }

    /**
     * Get the next job from the queue connection.
     *
     * @param  \Illuminate\Contracts\Queue\Queue  $connection
     * @param  string  $queue
     * @return \Illuminate\Contracts\Queue\Job|null
     */
    protected function getNextJob($connection, $queue)
    {
        try {
            foreach (explode(',', $queue) as $queue) {
                if (! is_null($job = $connection->pop($queue))) {
                    return $job;
                }
            }
        } catch (Exception $e) {
            $this->exceptions->report($e);
        } catch (Throwable $e) {
            $this->exceptions->report(new FatalThrowableError($e));
        }
    }