Add warning if old packages are required

src/Composer/Service/ReplaceBuilder.php

@@ -97,6 +97,16 @@ public function readBulks(): array
         return $bulkReplacements;
     }
 
+    /**
+     * @return string[]
+     */
+    public function readRequires(): array
+    {
+        $jsonData = $this->getJsonData();
+        $requires = $jsonData['require'] ?? [];
+        return array_keys($requires);
+    }
+
     /**
      * @return ReplacementCollection
      */
@@ -285,6 +295,13 @@ public function getErrors(): array
             $errors[] = $error;
         }
 
+        $requires = $this->readRequires();
+        foreach ($this->suggestedBulks() as $bulkName) {
+            if (in_array($bulkName, $requires)) {
+                $errors[] = 'Bulk "'.$bulkName.'" should not be in "require" section but in "extra.replace.bulk"';
+            }
+        }
+
         return $errors;
     }