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diff --git a/vendor/psy/psysh/src/TabCompletion/Matcher/AbstractDefaultParametersMatcher.php b/vendor/psy/psysh/src/TabCompletion/Matcher/AbstractDefaultParametersMatcher.php
new file mode 100644
index 000000000..1dc0765af
--- /dev/null
+++ b/vendor/psy/psysh/src/TabCompletion/Matcher/AbstractDefaultParametersMatcher.php
@@ -0,0 +1,76 @@
+<?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;
+
+abstract class AbstractDefaultParametersMatcher extends AbstractContextAwareMatcher
+{
+    /**
+     * @param \ReflectionParameter[] $reflectionParameters
+     *
+     * @return array
+     */
+    public function getDefaultParameterCompletion(array $reflectionParameters)
+    {
+        $parametersProcessed = [];
+
+        foreach ($reflectionParameters as $parameter) {
+            if (!$parameter->isDefaultValueAvailable()) {
+                return [];
+            }
+
+            $defaultValue = $this->valueToShortString($parameter->getDefaultValue());
+
+            $parametersProcessed[] = "\${$parameter->getName()} = $defaultValue";
+        }
+
+        if (empty($parametersProcessed)) {
+            return [];
+        }
+
+        return [implode(', ', $parametersProcessed) . ')'];
+    }
+
+    /**
+     * Takes in the default value of a parameter and turns it into a
+     *  string representation that fits inline.
+     * This is not 100% true to the original (newlines are inlined, for example).
+     *
+     * @param mixed $value
+     *
+     * @return string
+     */
+    private function valueToShortString($value)
+    {
+        if (!is_array($value)) {
+            return json_encode($value);
+        }
+
+        $chunks = [];
+        $chunksSequential = [];
+
+        $allSequential = true;
+
+        foreach ($value as $key => $item) {
+            $allSequential = $allSequential && is_numeric($key) && $key === count($chunksSequential);
+
+            $keyString  = $this->valueToShortString($key);
+            $itemString = $this->valueToShortString($item);
+
+            $chunks[] = "{$keyString} => {$itemString}";
+            $chunksSequential[] = $itemString;
+        }
+
+        $chunksToImplode = $allSequential ? $chunksSequential : $chunks;
+
+        return '[' . implode(', ', $chunksToImplode) . ']';
+    }
+}