Fix for enum signatures.

pkg/analyzer/lib/src/dart/element/element.dart

Index: pkg/analyzer/lib/src/dart/element/element.dart
diff --git a/pkg/analyzer/lib/src/dart/element/element.dart b/pkg/analyzer/lib/src/dart/element/element.dart
index 24d566ad0add79072b9afd512e186259b8ccd848..83a9c6e56cf8f0c5caa4cad7ef1dda98b69af48a 100644
--- a/pkg/analyzer/lib/src/dart/element/element.dart
+++ b/pkg/analyzer/lib/src/dart/element/element.dart
@@ -400,7 +400,11 @@ class ClassElementImpl extends ElementImpl implements ClassElement {
     if (isAbstract) {
       buffer.write('abstract ');
     }
-    buffer.write('class ');
+    if (isEnum) {
+      buffer.write('enum ');
+    } else {
+      buffer.write('class ');
+    }
     String name = displayName;
     if (name == null) {
       buffer.write("{unnamed class}");