Fix recovery to prevent generating a parameter with no name and no type (issue 30020)

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.
 
 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';
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/error/listener.dart';
@@ skipping 2878 matching lines @@
                 ParserErrorCode.EXPECTED_TOKEN,
                 ParserErrorCode.EXPECTED_TOKEN
               ]);
   }
 
   void test_functionTypedParameter_var() {
     parseCompilationUnit(
         "void f(var x()) {}", [ParserErrorCode.FUNCTION_TYPED_PARAMETER_VAR]);
   }
 
+  void test_genericFunctionType_extraLessThan() {
+    createParser('''
+class Wrong<T> {
+  T Function(<List<int> foo) bar;
+}''');
+    CompilationUnit unit = parser.parseCompilationUnit2();
+    expectNotNullIfNoErrors(unit);
+    listener.assertErrorsWithCodes([ParserErrorCode.UNEXPECTED_TOKEN]);
+  }
+
   void test_getterInFunction_block_noReturnType() {
     FunctionDeclarationStatement statement =
         parseStatement("get x { return _x; }");
     assertErrorsWithCodes([ParserErrorCode.GETTER_IN_FUNCTION]);
     expect(statement.functionDeclaration.functionExpression.parameters, isNull);
   }
 
   void test_getterInFunction_block_returnType() {
     parseStatement("int get x { return _x; }");
     assertErrorsWithCodes([ParserErrorCode.GETTER_IN_FUNCTION]);
@@ skipping 12246 matching lines @@
     expectCommentText(typeVariable.documentationComment, '/// Doc');
   }
 
   /**
    * Assert that the given [name] is in declaration context.
    */
   void _assertIsDeclarationName(SimpleIdentifier name) {
     expect(name.inDeclarationContext(), isTrue);
   }
 }