Fix exception when parsing broken code (issue 29447)

pkg/analyzer/test/generated/parser_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer.test.generated.parser_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_ast_factory.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
@@ skipping 3928 matching lines @@
   }
 
   void test_topLevelVariable_withMetadata() {
     parseCompilationUnit("String @A string;", [
       ParserErrorCode.MISSING_IDENTIFIER,
       ParserErrorCode.EXPECTED_TOKEN,
       ParserErrorCode.MISSING_CONST_FINAL_VAR_OR_TYPE
     ]);
   }
 
+  void test_typedef_incomplete() {
+    // TODO(brianwilkerson) Improve recovery for this case.
+    parseCompilationUnit(
+        '''
+class A {}
+class B extends A {}
+
+typedef T
+
+main() {
+  Function<
+}
+''',
+        [
+          ParserErrorCode.EXPECTED_TOKEN,
+          ParserErrorCode.UNEXPECTED_TOKEN,
+          ParserErrorCode.EXPECTED_EXECUTABLE
+        ]);
+  }
+
   void test_typedef_namedFunction() {
     // TODO(brianwilkerson) Improve recovery for this case.
     parseCompilationUnit('typedef void Function();', [
       ParserErrorCode.UNEXPECTED_TOKEN,
       ParserErrorCode.MISSING_IDENTIFIER,
       ParserErrorCode.EXPECTED_EXECUTABLE,
       ParserErrorCode.MISSING_TYPEDEF_PARAMETERS
     ]);
   }
 
@@ skipping 10997 matching lines @@
     expectCommentText(typeVariable.documentationComment, '/// Doc');
   }
 
   /**
    * Assert that the given [name] is in declaration context.
    */
   void _assertIsDeclarationName(SimpleIdentifier name) {
     expect(name.inDeclarationContext(), isTrue);
   }
 }