Fix diagnostics (#1226)

.github/workflows/build.yml

@@ -17,12 +17,11 @@ jobs:
       matrix:
         package:
           - packages/freezed
+          - packages/freezed/example
           - packages/freezed_annotation
           - packages/freezed_lint
         channel:
           - master
-          # BLocked by https://github.com/dart-lang/source_gen/issues/739
-          # - stable
         dependencies:
           - get
           - downgrade
@@ -38,7 +37,7 @@ jobs:
       - uses: subosito/flutter-action@v2
         with:
           channel: ${{ matrix.channel }}
-          cache: ${{ matrix.channel == 'stable' }}
+          cache: ${{ matrix.channel == 'master' }}
 
       # It is executed separately
       - name: Removing example folder

packages/freezed/CHANGELOG.md

@@ -2,6 +2,7 @@
 
 - Fix ==/hashCode when using inheritance.
   The generated ==/hashCode now call `super == other` when necessary.
+- Fix an issue with `Diagnosticable` and `toString`
 
 ## 3.0.4 - 2025-03-16
 

packages/freezed/example/lib/diagnosticable.dart

@@ -25,7 +25,5 @@ abstract class ToString with _$ToString {
   factory ToString() = _ToString;
 
   @override
-  String toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) {
-    return 'MyToString()';
-  }
+  String toString() => 'MyToString()';
 }

packages/freezed/lib/src/templates/abstract_template.dart

@@ -33,8 +33,10 @@ class Abstract {
         .expand((e) => [e.abstractGetter, if (!e.isFinal) e.abstractSetter])
         .join();
 
-    var interfaces =
-        [if (globalData.hasDiagnostics) 'DiagnosticableTreeMixin'].join();
+    var interfaces = [
+      if (globalData.hasDiagnostics && data.options.asString)
+        'DiagnosticableTreeMixin'
+    ].join();
     if (interfaces.isNotEmpty) interfaces = ' implements $interfaces';
 
     return '''