Stop unwanted sharing between filter closures.

pkg/analyzer/lib/src/task/options.dart

Index: pkg/analyzer/lib/src/task/options.dart
diff --git a/pkg/analyzer/lib/src/task/options.dart b/pkg/analyzer/lib/src/task/options.dart
index 8330e86a66e071225c628ba7c7980bdb21536d63..d4b9b1f1ce50b6eda7128a1c937cb8af182029df 100644
--- a/pkg/analyzer/lib/src/task/options.dart
+++ b/pkg/analyzer/lib/src/task/options.dart
@@ -30,6 +30,9 @@ class AnalyzerOptions {
   static const String plugins = 'plugins';
   static const String strong_mode = 'strong-mode';
 
+  /// Ways to say `ignore`.
+  static const List<String> ignoreSynonyms = const ['ignore', 'false'];
+
   /// Supported top-level `analyzer` options.
   static const List<String> top_level = const [
     errors,