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diff --git a/web/modules/contrib/drupalmoduleupgrader/src/Routing/LinkIndex.php b/web/modules/contrib/drupalmoduleupgrader/src/Routing/LinkIndex.php
new file mode 100644
index 000000000..71a0846fa
--- /dev/null
+++ b/web/modules/contrib/drupalmoduleupgrader/src/Routing/LinkIndex.php
@@ -0,0 +1,60 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\drupalmoduleupgrader\Converter\Routing\LinkIndex.
+ */
+
+namespace Drupal\drupalmoduleupgrader\Routing;
+
+use Doctrine\Common\Collections\ArrayCollection;
+use Drupal\drupalmoduleupgrader\Routing\LinkBinding\LinkBinding;
+
+/**
+ * Represents a set of link bindings of a single type (i.e., menu links, local tasks, etc.)
+ */
+class LinkIndex extends ArrayCollection {
+
+  /**
+   * Tracks link IDs to prevent collisions.
+   *
+   * @var string[]
+   */
+  protected $idiotBox = [];
+
+  /**
+   * Adds a binding to this index.
+   *
+   * @param \Drupal\drupalmoduleupgrader\Routing\LinkBinding\LinkBinding $binding
+   */
+  public function addBinding(LinkBinding $binding) {
+    $id = $binding->getIdentifier();
+
+    if (isset($this->idiotBox[$id])) {
+      $id .= '_' . $this->idiotBox[$id]++;
+    }
+    else {
+      $this->idiotBox[$id] = 0;
+    }
+
+    $this->set($binding->getSource()->getPath()->__toString(), $binding);
+    $binding->onIndexed($id, $this);
+  }
+
+  /**
+   * Builds all the links in this index and returns them as an array of arrays,
+   * keyed by link ID.
+   *
+   * @return array
+   */
+  public function build() {
+    $build = [];
+
+    foreach ($this as $binding) {
+      $build[ $binding->getIdentifier() ] = $binding->build();
+    }
+
+    return $build;
+  }
+
+}