Hide more temporary variables when debugging

dwds/CHANGELOG.md

@@ -4,6 +4,8 @@
 - Respect the value of `pause_isolates_on_start` during page-refreshes. - [#2431](https://github.com/dart-lang/webdev/pull/2431)
 - Fix issue where DAP clients wouldn't resume after a restart. - [#2441](https://github.com/dart-lang/webdev/pull/2441)
 - Add implementation for the VM Service's `getFlagList` API. - [#2438](https://github.com/dart-lang/webdev/pull/2438)
+- Hide more variables from the local scope when debugging. These variables were synthetically added by the compiler to
+  support late local variables and don't appear in the original source code. - [#2445](https://github.com/dart-lang/webdev/pull/2445)
 
 ## 24.0.0
 

dwds/lib/src/debugging/dart_scope.dart

@@ -12,7 +12,15 @@ import 'package:webkit_inspection_protocol/webkit_inspection_protocol.dart';
 /// TODO(annagrin) - use an alternative way to identify
 /// synthetic variables.
 /// Issue: https://github.com/dart-lang/sdk/issues/44262
-final ddcTemporaryVariableRegExp = RegExp(r'^t(\$[0-9]*)+\w*$');
+final ddcTemporaryVariableRegExp = RegExp(
+    // Starts with t$
+    r'^t\$'
+    // followed by anything
+    r'.*'
+    // or,
+    r'|'
+    // anything that contains the sequence '$35'.
+    r'.*\$35.*');
 final ddcTemporaryTypeVariableRegExp = RegExp(r'^__t[\$\w*]+$');
 
 /// Temporary variable regex before SDK changes for patterns.

dwds/test/variable_scope_test.dart

@@ -71,6 +71,14 @@ void main() {
         ddcTemporaryVariableRegExp.hasMatch(r't$36$350$354$35isSet'),
         isTrue,
       );
+      expect(
+        ddcTemporaryVariableRegExp.hasMatch(r't$36$35variable$35isSet'),
+        isTrue,
+      );
+      expect(
+        ddcTemporaryVariableRegExp.hasMatch(r'synthetic$35variable'),
+        isTrue,
+      );
       expect(ddcTemporaryTypeVariableRegExp.hasMatch(r'__t$TL'), isTrue);
       expect(ddcTemporaryTypeVariableRegExp.hasMatch(r'__t$StringN'), isTrue);
       expect(
@@ -84,6 +92,7 @@ void main() {
       expect(ddcTemporaryVariableRegExp.hasMatch(r't10'), isFalse);
       expect(ddcTemporaryVariableRegExp.hasMatch(r't10foo'), isFalse);
       expect(ddcTemporaryVariableRegExp.hasMatch(r'ten'), isFalse);
+      expect(ddcTemporaryVariableRegExp.hasMatch(r'my$3635variable'), isFalse);
     });
   });