Issue 16827. Add 'set length' to NodeList.

pkg/analyzer/lib/src/generated/ast.dart

Index: pkg/analyzer/lib/src/generated/ast.dart
diff --git a/pkg/analyzer/lib/src/generated/ast.dart b/pkg/analyzer/lib/src/generated/ast.dart
index c7f631c7e05043d95541843da17a13f7f3393c79..738761b7911c163c79bb76b384f7bf0a96bd07d7 100644
--- a/pkg/analyzer/lib/src/generated/ast.dart
+++ b/pkg/analyzer/lib/src/generated/ast.dart
@@ -16468,4 +16468,7 @@ class NodeList<E extends ASTNode> extends Object with ListMixin<E> {
     _elements[index] = node;
   }
   int get length => _elements.length;
+  void set length(int value) {
+    throw new UnsupportedError("Cannot resize NodeList.");
+  }
 }