Add better logging when a fragment can not be found

src/GraphQL/Fragment/GraphQLFragmentLoader.php

@@ -93,11 +93,11 @@ class GraphQLFragmentLoader implements GraphQLFragmentLoaderInterface {
       foreach ($matches[1] as $key => $match) {
         $fragmentPath = realpath($baseDir . '/' . $match);
         if (!$this->isFragmentPathValid($fragmentPath)) {
-          $this->logger->warning($this->t("Fragment path '@fragment-path' is not valid.", ['@fragment-path' => $fragmentPath]));
+          $this->logger->warning($this->t("Fragment path '@fragment-path' is not valid (derived from '@match').", ['@fragment-path' => $fragmentPath, '@match' => $match]));
           continue;
         }
         if (!is_file($fragmentPath)) {
-          $this->logger->warning($this->t("No fragment '@fragment-path' found.", ['@fragment-path' => $fragmentPath]));
+          $this->logger->warning($this->t("No fragment '@fragment-path' found (derived from '@match').", ['@fragment-path' => $fragmentPath, '@match' => $match]));
           continue;
         }