new handleInvalidTopLevelDeclaration event in fasta parser

pkg/analyzer/lib/src/fasta/ast_builder.dart

Index: pkg/analyzer/lib/src/fasta/ast_builder.dart
diff --git a/pkg/analyzer/lib/src/fasta/ast_builder.dart b/pkg/analyzer/lib/src/fasta/ast_builder.dart
index 7c3bf9ef2ef70ad80e32c90c915515a95e1a0cd7..1639a3ea8253d51004ecbdf207950d4ab203a407 100644
--- a/pkg/analyzer/lib/src/fasta/ast_builder.dart
+++ b/pkg/analyzer/lib/src/fasta/ast_builder.dart
@@ -1124,6 +1124,15 @@ class AstBuilder extends ScopeListener {
   }
 
   @override
+  void handleInvalidTopLevelDeclaration(Token beginToken, Token endToken) {
+    // TODO(danrubel): consider creating a AST node
+    // representing the invalid declaration
+    // to support code completion, quick fixes, etc.
+    super.handleInvalidTopLevelDeclaration(beginToken, endToken);
+    pop(); // comment
+  }
+
+  @override
   void beginCompilationUnit(Token token) {
     push(token);
   }