improve parser recovery of type argument list

pkg/analyzer/test/generated/parser_test.dart

Index: pkg/analyzer/test/generated/parser_test.dart
diff --git a/pkg/analyzer/test/generated/parser_test.dart b/pkg/analyzer/test/generated/parser_test.dart
index a89539e14d7406fee3f91691c96b427d4f52b841..4a9c8255e74757f8b02ef1a2a6e8d37759f8105a 100644
--- a/pkg/analyzer/test/generated/parser_test.dart
+++ b/pkg/analyzer/test/generated/parser_test.dart
@@ -8766,6 +8766,18 @@ void''');
     expect(identifier.name, lexeme);
   }
 
+  void test_parseStatement_emptyTypeArgumentListt() {
+    VariableDeclarationStatement statement = ParserTestCase.parse4(
+        "parseStatement", "C<> c;", [ParserErrorCode.EXPECTED_TYPE_NAME]);
+    VariableDeclarationList variables = statement.variables;
+    TypeName type = variables.type;
+    TypeArgumentList argumentList = type.typeArguments;
+    expect(argumentList.leftBracket, isNotNull);
+    expect(argumentList.arguments, hasLength(1));
+    expect(argumentList.arguments[0].isSynthetic, isTrue);
+    expect(argumentList.rightBracket, isNotNull);
+  }
+
   void test_parseStatement_functionDeclaration() {
     // TODO(brianwilkerson) Implement more tests for this method.
     FunctionDeclarationStatement statement =
@@ -9131,6 +9143,14 @@ void''');
     expect(typeAlias.typeParameters, isNull);
   }
 
+  void test_parseTypeArgumentList_empty() {
+    TypeArgumentList argumentList = ParserTestCase.parse4(
+        "parseTypeArgumentList", "<>", [ParserErrorCode.EXPECTED_TYPE_NAME]);
+    expect(argumentList.leftBracket, isNotNull);
+    expect(argumentList.arguments, hasLength(1));
+    expect(argumentList.rightBracket, isNotNull);
+  }
+
   void test_parseTypeArgumentList_multiple() {
     TypeArgumentList argumentList =
         parse4("parseTypeArgumentList", "<int, int, int>");