translate missing ">" fasta error code to analyzer error

pkg/analyzer/test/generated/scanner_test.dart

Index: pkg/analyzer/test/generated/scanner_test.dart
diff --git a/pkg/analyzer/test/generated/scanner_test.dart b/pkg/analyzer/test/generated/scanner_test.dart
index 76d0fd287f41332d390c7e7331ecf3c0dadc596b..0a53f95aa51b7d6b7d510ea81a87e5dab59ed43c 100644
--- a/pkg/analyzer/test/generated/scanner_test.dart
+++ b/pkg/analyzer/test/generated/scanner_test.dart
@@ -79,6 +79,19 @@ class CharacterRangeReaderTest extends EngineTestCase {
 
 @reflectiveTest
 class LineInfoTest extends EngineTestCase {
+  void test_translate_missing_closing_gt_error() {
+    // Ensure that the UnmatchedToken error for missing '>' is translated
+    // to the correct analyzer error code.
+    // See https://github.com/dart-lang/sdk/issues/30320
+    String source = '<!-- @Component(';
+    GatheringErrorListener listener = new GatheringErrorListener();
+    _scanWithListener(source, listener);
+    listener.assertErrorsWithCodes(const [
+      ScannerErrorCode.EXPECTED_TOKEN,
+      ScannerErrorCode.EXPECTED_TOKEN,
+    ]);
+  }
+
   void test_lineInfo_multilineComment() {
     String source = "/*\r\n *\r\n */";
     _assertLineInfo(source, [