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diff --git a/vendor/composer/semver/src/Constraint/AbstractConstraint.php b/vendor/composer/semver/src/Constraint/AbstractConstraint.php
new file mode 100644
index 000000000..be83f750b
--- /dev/null
+++ b/vendor/composer/semver/src/Constraint/AbstractConstraint.php
@@ -0,0 +1,63 @@
+<?php
+
+/*
+ * This file is part of composer/semver.
+ *
+ * (c) Composer <https://github.com/composer>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Composer\Semver\Constraint;
+
+trigger_error('The ' . __CLASS__ . ' abstract class is deprecated, there is no replacement for it, it will be removed in the next major version.', E_USER_DEPRECATED);
+
+/**
+ * Base constraint class.
+ */
+abstract class AbstractConstraint implements ConstraintInterface
+{
+    /** @var string */
+    protected $prettyString;
+
+    /**
+     * @param ConstraintInterface $provider
+     *
+     * @return bool
+     */
+    public function matches(ConstraintInterface $provider)
+    {
+        if ($provider instanceof $this) {
+            // see note at bottom of this class declaration
+            return $this->matchSpecific($provider);
+        }
+
+        // turn matching around to find a match
+        return $provider->matches($this);
+    }
+
+    /**
+     * @param string $prettyString
+     */
+    public function setPrettyString($prettyString)
+    {
+        $this->prettyString = $prettyString;
+    }
+
+    /**
+     * @return string
+     */
+    public function getPrettyString()
+    {
+        if ($this->prettyString) {
+            return $this->prettyString;
+        }
+
+        return $this->__toString();
+    }
+
+    // implementations must implement a method of this format:
+    // not declared abstract here because type hinting violates parameter coherence (TODO right word?)
+    // public function matchSpecific(<SpecificConstraintType> $provider);
+}