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diff --git a/vendor/psy/psysh/src/CodeCleaner/ValidClassNamePass.php b/vendor/psy/psysh/src/CodeCleaner/ValidClassNamePass.php
new file mode 100644
index 000000000..f62e2a4a6
--- /dev/null
+++ b/vendor/psy/psysh/src/CodeCleaner/ValidClassNamePass.php
@@ -0,0 +1,394 @@
+<?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\CodeCleaner;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr;
+use PhpParser\Node\Expr\ClassConstFetch;
+use PhpParser\Node\Expr\New_;
+use PhpParser\Node\Expr\StaticCall;
+use PhpParser\Node\Stmt;
+use PhpParser\Node\Stmt\Class_;
+use PhpParser\Node\Stmt\Do_;
+use PhpParser\Node\Stmt\If_;
+use PhpParser\Node\Stmt\Interface_;
+use PhpParser\Node\Stmt\Switch_;
+use PhpParser\Node\Stmt\Trait_;
+use PhpParser\Node\Stmt\While_;
+use Psy\Exception\FatalErrorException;
+
+/**
+ * Validate that classes exist.
+ *
+ * This pass throws a FatalErrorException rather than letting PHP run
+ * headfirst into a real fatal error and die.
+ */
+class ValidClassNamePass extends NamespaceAwarePass
+{
+    const CLASS_TYPE     = 'class';
+    const INTERFACE_TYPE = 'interface';
+    const TRAIT_TYPE     = 'trait';
+
+    protected $checkTraits;
+    private $conditionalScopes = 0;
+    private $atLeastPhp55;
+
+    public function __construct()
+    {
+        $this->checkTraits = function_exists('trait_exists');
+        $this->atLeastPhp55 = version_compare(PHP_VERSION, '5.5', '>=');
+    }
+
+    /**
+     * Validate class, interface and trait definitions.
+     *
+     * Validate them upon entering the node, so that we know about their
+     * presence and can validate constant fetches and static calls in class or
+     * trait methods.
+     *
+     * @param Node $node
+     */
+    public function enterNode(Node $node)
+    {
+        parent::enterNode($node);
+
+        if (self::isConditional($node)) {
+            $this->conditionalScopes++;
+        } else {
+            // @todo add an "else" here which adds a runtime check for instances where we can't tell
+            // whether a class is being redefined by static analysis alone.
+            if ($this->conditionalScopes === 0) {
+                if ($node instanceof Class_) {
+                    $this->validateClassStatement($node);
+                } elseif ($node instanceof Interface_) {
+                    $this->validateInterfaceStatement($node);
+                } elseif ($node instanceof Trait_) {
+                    $this->validateTraitStatement($node);
+                }
+            }
+        }
+    }
+
+    /**
+     * Validate `new` expressions, class constant fetches, and static calls.
+     *
+     * @throws FatalErrorException if a class, interface or trait is referenced which does not exist
+     * @throws FatalErrorException if a class extends something that is not a class
+     * @throws FatalErrorException if a class implements something that is not an interface
+     * @throws FatalErrorException if an interface extends something that is not an interface
+     * @throws FatalErrorException if a class, interface or trait redefines an existing class, interface or trait name
+     *
+     * @param Node $node
+     */
+    public function leaveNode(Node $node)
+    {
+        if (self::isConditional($node)) {
+            $this->conditionalScopes--;
+        } elseif ($node instanceof New_) {
+            $this->validateNewExpression($node);
+        } elseif ($node instanceof ClassConstFetch) {
+            $this->validateClassConstFetchExpression($node);
+        } elseif ($node instanceof StaticCall) {
+            $this->validateStaticCallExpression($node);
+        }
+    }
+
+    private static function isConditional(Node $node)
+    {
+        return $node instanceof If_ ||
+            $node instanceof While_ ||
+            $node instanceof Do_ ||
+            $node instanceof Switch_;
+    }
+
+    /**
+     * Validate a class definition statement.
+     *
+     * @param Class_ $stmt
+     */
+    protected function validateClassStatement(Class_ $stmt)
+    {
+        $this->ensureCanDefine($stmt);
+        if (isset($stmt->extends)) {
+            $this->ensureClassExists($this->getFullyQualifiedName($stmt->extends), $stmt);
+        }
+        $this->ensureInterfacesExist($stmt->implements, $stmt);
+    }
+
+    /**
+     * Validate an interface definition statement.
+     *
+     * @param Interface_ $stmt
+     */
+    protected function validateInterfaceStatement(Interface_ $stmt)
+    {
+        $this->ensureCanDefine($stmt);
+        $this->ensureInterfacesExist($stmt->extends, $stmt);
+    }
+
+    /**
+     * Validate a trait definition statement.
+     *
+     * @param Trait_ $stmt
+     */
+    protected function validateTraitStatement(Trait_ $stmt)
+    {
+        $this->ensureCanDefine($stmt);
+    }
+
+    /**
+     * Validate a `new` expression.
+     *
+     * @param New_ $stmt
+     */
+    protected function validateNewExpression(New_ $stmt)
+    {
+        // if class name is an expression or an anonymous class, give it a pass for now
+        if (!$stmt->class instanceof Expr && !$stmt->class instanceof Class_) {
+            $this->ensureClassExists($this->getFullyQualifiedName($stmt->class), $stmt);
+        }
+    }
+
+    /**
+     * Validate a class constant fetch expression's class.
+     *
+     * @param ClassConstFetch $stmt
+     */
+    protected function validateClassConstFetchExpression(ClassConstFetch $stmt)
+    {
+        // there is no need to check exists for ::class const for php 5.5 or newer
+        if (strtolower($stmt->name) === 'class' && $this->atLeastPhp55) {
+            return;
+        }
+
+        // if class name is an expression, give it a pass for now
+        if (!$stmt->class instanceof Expr) {
+            $this->ensureClassOrInterfaceExists($this->getFullyQualifiedName($stmt->class), $stmt);
+        }
+    }
+
+    /**
+     * Validate a class constant fetch expression's class.
+     *
+     * @param StaticCall $stmt
+     */
+    protected function validateStaticCallExpression(StaticCall $stmt)
+    {
+        // if class name is an expression, give it a pass for now
+        if (!$stmt->class instanceof Expr) {
+            $this->ensureMethodExists($this->getFullyQualifiedName($stmt->class), $stmt->name, $stmt);
+        }
+    }
+
+    /**
+     * Ensure that no class, interface or trait name collides with a new definition.
+     *
+     * @throws FatalErrorException
+     *
+     * @param Stmt $stmt
+     */
+    protected function ensureCanDefine(Stmt $stmt)
+    {
+        $name = $this->getFullyQualifiedName($stmt->name);
+
+        // check for name collisions
+        $errorType = null;
+        if ($this->classExists($name)) {
+            $errorType = self::CLASS_TYPE;
+        } elseif ($this->interfaceExists($name)) {
+            $errorType = self::INTERFACE_TYPE;
+        } elseif ($this->traitExists($name)) {
+            $errorType = self::TRAIT_TYPE;
+        }
+
+        if ($errorType !== null) {
+            throw $this->createError(sprintf('%s named %s already exists', ucfirst($errorType), $name), $stmt);
+        }
+
+        // Store creation for the rest of this code snippet so we can find local
+        // issue too
+        $this->currentScope[strtolower($name)] = $this->getScopeType($stmt);
+    }
+
+    /**
+     * Ensure that a referenced class exists.
+     *
+     * @throws FatalErrorException
+     *
+     * @param string $name
+     * @param Stmt   $stmt
+     */
+    protected function ensureClassExists($name, $stmt)
+    {
+        if (!$this->classExists($name)) {
+            throw $this->createError(sprintf('Class \'%s\' not found', $name), $stmt);
+        }
+    }
+
+    /**
+     * Ensure that a referenced class _or interface_ exists.
+     *
+     * @throws FatalErrorException
+     *
+     * @param string $name
+     * @param Stmt   $stmt
+     */
+    protected function ensureClassOrInterfaceExists($name, $stmt)
+    {
+        if (!$this->classExists($name) && !$this->interfaceExists($name)) {
+            throw $this->createError(sprintf('Class \'%s\' not found', $name), $stmt);
+        }
+    }
+
+    /**
+     * Ensure that a statically called method exists.
+     *
+     * @throws FatalErrorException
+     *
+     * @param string $class
+     * @param string $name
+     * @param Stmt   $stmt
+     */
+    protected function ensureMethodExists($class, $name, $stmt)
+    {
+        $this->ensureClassExists($class, $stmt);
+
+        // let's pretend all calls to self, parent and static are valid
+        if (in_array(strtolower($class), ['self', 'parent', 'static'])) {
+            return;
+        }
+
+        // ... and all calls to classes defined right now
+        if ($this->findInScope($class) === self::CLASS_TYPE) {
+            return;
+        }
+
+        // if method name is an expression, give it a pass for now
+        if ($name instanceof Expr) {
+            return;
+        }
+
+        if (!method_exists($class, $name) && !method_exists($class, '__callStatic')) {
+            throw $this->createError(sprintf('Call to undefined method %s::%s()', $class, $name), $stmt);
+        }
+    }
+
+    /**
+     * Ensure that a referenced interface exists.
+     *
+     * @throws FatalErrorException
+     *
+     * @param Interface_[] $interfaces
+     * @param Stmt         $stmt
+     */
+    protected function ensureInterfacesExist($interfaces, $stmt)
+    {
+        foreach ($interfaces as $interface) {
+            /** @var string $name */
+            $name = $this->getFullyQualifiedName($interface);
+            if (!$this->interfaceExists($name)) {
+                throw $this->createError(sprintf('Interface \'%s\' not found', $name), $stmt);
+            }
+        }
+    }
+
+    /**
+     * Get a symbol type key for storing in the scope name cache.
+     *
+     * @param Stmt $stmt
+     *
+     * @return string
+     */
+    protected function getScopeType(Stmt $stmt)
+    {
+        if ($stmt instanceof Class_) {
+            return self::CLASS_TYPE;
+        } elseif ($stmt instanceof Interface_) {
+            return self::INTERFACE_TYPE;
+        } elseif ($stmt instanceof Trait_) {
+            return self::TRAIT_TYPE;
+        }
+    }
+
+    /**
+     * Check whether a class exists, or has been defined in the current code snippet.
+     *
+     * Gives `self`, `static` and `parent` a free pass.
+     *
+     * @param string $name
+     *
+     * @return bool
+     */
+    protected function classExists($name)
+    {
+        // Give `self`, `static` and `parent` a pass. This will actually let
+        // some errors through, since we're not checking whether the keyword is
+        // being used in a class scope.
+        if (in_array(strtolower($name), ['self', 'static', 'parent'])) {
+            return true;
+        }
+
+        return class_exists($name) || $this->findInScope($name) === self::CLASS_TYPE;
+    }
+
+    /**
+     * Check whether an interface exists, or has been defined in the current code snippet.
+     *
+     * @param string $name
+     *
+     * @return bool
+     */
+    protected function interfaceExists($name)
+    {
+        return interface_exists($name) || $this->findInScope($name) === self::INTERFACE_TYPE;
+    }
+
+    /**
+     * Check whether a trait exists, or has been defined in the current code snippet.
+     *
+     * @param string $name
+     *
+     * @return bool
+     */
+    protected function traitExists($name)
+    {
+        return $this->checkTraits && (trait_exists($name) || $this->findInScope($name) === self::TRAIT_TYPE);
+    }
+
+    /**
+     * Find a symbol in the current code snippet scope.
+     *
+     * @param string $name
+     *
+     * @return string|null
+     */
+    protected function findInScope($name)
+    {
+        $name = strtolower($name);
+        if (isset($this->currentScope[$name])) {
+            return $this->currentScope[$name];
+        }
+    }
+
+    /**
+     * Error creation factory.
+     *
+     * @param string $msg
+     * @param Stmt   $stmt
+     *
+     * @return FatalErrorException
+     */
+    protected function createError($msg, $stmt)
+    {
+        return new FatalErrorException($msg, 0, E_ERROR, null, $stmt->getLine());
+    }
+}