Do not fail when an enum constant is annotated (issue 26413)

pkg/analyzer/test/src/dart/constant/utilities_test.dart

Index: pkg/analyzer/test/src/dart/constant/utilities_test.dart
diff --git a/pkg/analyzer/test/src/dart/constant/utilities_test.dart b/pkg/analyzer/test/src/dart/constant/utilities_test.dart
index a922cf5247f9e534ac518e2c918dd4a80933930d..f4fd958ba676357c556a5e1c5282748028319671 100644
--- a/pkg/analyzer/test/src/dart/constant/utilities_test.dart
+++ b/pkg/analyzer/test/src/dart/constant/utilities_test.dart
@@ -61,6 +61,15 @@ class ConstantFinderTest {
     expect(_findAnnotations(), contains(_node));
   }
 
+  void test_visitAnnotation_enumConstant() {
+    // Analyzer ignores annotations on enum constant declarations.
+    Annotation annotation = AstFactory.annotation2(
+        AstFactory.identifier3('A'), null, AstFactory.argumentList());
+    _node = new EnumConstantDeclaration(
+        null, <Annotation>[annotation], AstFactory.identifier3('C'));
+    expect(_findConstants(), isEmpty);
+  }
+
   /**
    * Test an annotation that represents the invocation of a constant
    * constructor.