[Debug][HttpKernel][VarDumper] Prepare for committed 7.2 changes

Author: nicolas-grekas

DataCollector/Util/ValueExporter.php

@@ -27,6 +27,10 @@ class ValueExporter
      */
     public function exportValue($value, $depth = 1, $deep = false)
     {
+        if ($value instanceof \__PHP_Incomplete_Class) {
+            return sprintf('__PHP_Incomplete_Class(%s)', $this->getClassNameFromIncomplete($value));
+        }
+
         if (is_object($value)) {
             if ($value instanceof \DateTime || $value instanceof \DateTimeInterface) {
                 return sprintf('Object(%s) - %s', get_class($value), $value->format(\DateTime::ISO8601));
@@ -35,10 +39,6 @@ public function exportValue($value, $depth = 1, $deep = false)
             return sprintf('Object(%s)', get_class($value));
         }
 
-        if ($value instanceof \__PHP_Incomplete_Class) {
-            return sprintf('__PHP_Incomplete_Class(%s)', $this->getClassNameFromIncomplete($value));
-        }
-
         if (is_array($value)) {
             if (empty($value)) {
                 return '[]';