# System.Diagnostics.CodeAnalysis

``` diff
 namespace System.Diagnostics.CodeAnalysis {
+    public sealed class FeatureGuardAttribute : Attribute {
+        public FeatureGuardAttribute(Type featureType);
+        public Type FeatureType { get; }
+    }
+    public sealed class FeatureSwitchDefinitionAttribute : Attribute {
+        public FeatureSwitchDefinitionAttribute(string switchName);
+        public string SwitchName { get; }
+    }
 }
```

