Discard unused nesting levels.

benchmark/after.dart.txt

Index: benchmark/after.dart.txt
diff --git a/benchmark/after.dart.txt b/benchmark/after.dart.txt
index d1a2a929352872c8a181bcbcf2727d6bf9b83deb..fc7499737c84fedc16da733c970460e84be7d329 100644
--- a/benchmark/after.dart.txt
+++ b/benchmark/after.dart.txt
@@ -96,6 +96,21 @@ class BacktrackingSolver {
             tag == 'input' && (name == 'value' || name == 'checked') ||
             tag == 'select' && (name == 'selectedindex' || name == 'value') ||
             tag == 'textarea' && name == 'value');
+
+    // Even more deeply nested pathological example.
+    if (javaBooleanAnd(javaBooleanAnd(javaBooleanAnd(javaBooleanAnd(
+                    javaBooleanAnd(javaBooleanAnd(javaBooleanAnd(
+                                javaBooleanAnd(),
+                                _isEqualTokens(node.period, toNode.period)),
+                            _isEqualNodes(node.name, toNode.name)),
+                        _isEqualNodes(node.parameters, toNode.parameters)),
+                    _isEqualTokens(node.separator, toNode.separator)),
+                _isEqualNodeLists(node.initializers, toNode.initializers)),
+            _isEqualNodes(
+                node.redirectedConstructor, toNode.redirectedConstructor)),
+        _isEqualNodes(node.body, toNode.body))) {
+      toNode.element = node.element;
+    }
   }
 
   /// Run the solver.