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diff --git a/vendor/psy/psysh/src/Command/ThrowUpCommand.php b/vendor/psy/psysh/src/Command/ThrowUpCommand.php
new file mode 100644
index 000000000..4b7003d10
--- /dev/null
+++ b/vendor/psy/psysh/src/Command/ThrowUpCommand.php
@@ -0,0 +1,158 @@
+<?php
+
+/*
+ * This file is part of Psy Shell.
+ *
+ * (c) 2012-2018 Justin Hileman
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Psy\Command;
+
+use PhpParser\Node\Arg;
+use PhpParser\Node\Expr\StaticCall;
+use PhpParser\Node\Expr\Variable;
+use PhpParser\Node\Name\FullyQualified as FullyQualifiedName;
+use PhpParser\Node\Stmt\Throw_;
+use PhpParser\PrettyPrinter\Standard as Printer;
+use Psy\Context;
+use Psy\ContextAware;
+use Psy\Input\CodeArgument;
+use Psy\ParserFactory;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Throw an exception or error out of the Psy Shell.
+ */
+class ThrowUpCommand extends Command implements ContextAware
+{
+    const THROW_CLASS = 'Psy\Exception\ThrowUpException';
+
+    private $parser;
+    private $printer;
+
+    /**
+     * Context instance (for ContextAware interface).
+     *
+     * @var Context
+     */
+    protected $context;
+
+    /**
+     * {@inheritdoc}
+     */
+    public function __construct($name = null)
+    {
+        $parserFactory = new ParserFactory();
+
+        $this->parser  = $parserFactory->createParser();
+        $this->printer = new Printer();
+
+        parent::__construct($name);
+    }
+
+    /**
+     * ContextAware interface.
+     *
+     * @param Context $context
+     */
+    public function setContext(Context $context)
+    {
+        $this->context = $context;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this
+            ->setName('throw-up')
+            ->setDefinition([
+                new CodeArgument('exception', CodeArgument::OPTIONAL, 'Exception or Error to throw.'),
+            ])
+            ->setDescription('Throw an exception or error out of the Psy Shell.')
+            ->setHelp(
+                <<<'HELP'
+Throws an exception or error out of the current the Psy Shell instance.
+
+By default it throws the most recent exception.
+
+e.g.
+<return>>>> throw-up</return>
+<return>>>> throw-up $e</return>
+<return>>>> throw-up new Exception('WHEEEEEE!')</return>
+HELP
+            );
+    }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @throws InvalidArgumentException if there is no exception to throw
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $args = $this->prepareArgs($input->getArgument('exception'));
+        $throwStmt = new Throw_(new StaticCall(new FullyQualifiedName(self::THROW_CLASS), 'fromThrowable', $args));
+        $throwCode = $this->printer->prettyPrint([$throwStmt]);
+
+        $shell = $this->getApplication();
+        $shell->addCode($throwCode, !$shell->hasCode());
+    }
+
+    /**
+     * Parse the supplied command argument.
+     *
+     * If no argument was given, this falls back to `$_e`
+     *
+     * @throws InvalidArgumentException if there is no exception to throw
+     *
+     * @param string $code
+     *
+     * @return Arg[]
+     */
+    private function prepareArgs($code = null)
+    {
+        if (!$code) {
+            // Default to last exception if nothing else was supplied
+            return [new Arg(new Variable('_e'))];
+        }
+
+        if (strpos('<?', $code) === false) {
+            $code = '<?php ' . $code;
+        }
+
+        $expr = $this->parse($code);
+
+        if (count($expr) !== 1) {
+            throw new \InvalidArgumentException('No idea how to throw this');
+        }
+
+        return [new Arg($expr[0])];
+    }
+
+    /**
+     * Lex and parse a string of code into statements.
+     *
+     * @param string $code
+     *
+     * @return array Statements
+     */
+    private function parse($code)
+    {
+        try {
+            return $this->parser->parse($code);
+        } catch (\PhpParser\Error $e) {
+            if (strpos($e->getMessage(), 'unexpected EOF') === false) {
+                throw $e;
+            }
+
+            // If we got an unexpected EOF, let's try it again with a semicolon.
+            return $this->parser->parse($code . ';');
+        }
+    }
+}