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diff --git a/vendor/psy/psysh/src/TabCompletion/Matcher/ConstantsMatcher.php b/vendor/psy/psysh/src/TabCompletion/Matcher/ConstantsMatcher.php
new file mode 100644
index 000000000..ddd8bcb0c
--- /dev/null
+++ b/vendor/psy/psysh/src/TabCompletion/Matcher/ConstantsMatcher.php
@@ -0,0 +1,54 @@
+<?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\TabCompletion\Matcher;
+
+/**
+ * A constant name tab completion Matcher.
+ *
+ * This matcher provides completion for all defined constants.
+ *
+ * @author Marc Garcia <markcial@gmail.com>
+ */
+class ConstantsMatcher extends AbstractMatcher
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function getMatches(array $tokens, array $info = [])
+    {
+        $const = $this->getInput($tokens);
+
+        return array_filter(array_keys(get_defined_constants()), function ($constant) use ($const) {
+            return AbstractMatcher::startsWith($const, $constant);
+        });
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function hasMatched(array $tokens)
+    {
+        $token     = array_pop($tokens);
+        $prevToken = array_pop($tokens);
+
+        switch (true) {
+            case self::tokenIs($prevToken, self::T_NEW):
+            case self::tokenIs($prevToken, self::T_NS_SEPARATOR):
+                return false;
+            case self::hasToken([self::T_OPEN_TAG, self::T_STRING], $token):
+            case self::isOperator($token):
+                return true;
+        }
+
+        return false;
+    }
+}