Update listener error handling.

pkg/fasta/lib/src/kernel/body_builder.dart

Index: pkg/fasta/lib/src/kernel/body_builder.dart
diff --git a/pkg/fasta/lib/src/kernel/body_builder.dart b/pkg/fasta/lib/src/kernel/body_builder.dart
index 10c608be2f3ce4d8632287de0fb122ed8cc3c386..9b9d7ac4a5177af0386ad5175bd5dbccd82c69c0 100644
--- a/pkg/fasta/lib/src/kernel/body_builder.dart
+++ b/pkg/fasta/lib/src/kernel/body_builder.dart
@@ -2157,7 +2157,7 @@ class BodyBuilder extends ScopeListener<JumpTarget> implements BuilderHelper {
     if (trailing.contains(token.stringValue) && trailing.contains(string)) {
       // We're just trying to get out an error.
       if (recoverableErrors.isNotEmpty) {
-        reportError(token, ErrorKind.UNSPECIFIED,
+        reportError(token, ErrorKind.Unspecified,
             {"text": "Expected: '$string', but got '${token.value}'"});
       }
       return token;