# System.Runtime.CompilerServices

``` diff
 namespace System.Runtime.CompilerServices {
     public sealed class ConditionalWeakTable<TKey, TValue> : IEnumerable, IEnumerable<KeyValuePair<TKey, TValue>> where TKey : class where TValue : class {
-        ~ConditionalWeakTable();

     }
     public sealed class SwitchExpressionException : InvalidOperationException {
+        public override string Message { get; }
     }
 }
```

