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Changes TreeBuilder with root() call to constructor passed root and getRootNode() call
use Symfony\Component\Config\Definition\Builder\TreeBuilder;
-$treeBuilder = new TreeBuilder();
-$rootNode = $treeBuilder->root('acme_root');
+$treeBuilder = new TreeBuilder('acme_root');
+$rootNode = $treeBuilder->getRootNode();
$rootNode->someCall();