Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.ServiceModel.Internals/System/Runtime/FatalException.cs

@@ -0,0 +1,30 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//-----------------------------------------------------------------------------
+
+namespace System.Runtime
+{
+    using System;
+    using System.Runtime.Serialization;
+
+    [Serializable]
+    class FatalException : SystemException
+    {
+        public FatalException()
+        {
+        }
+        public FatalException(string message) : base(message)
+        {
+        }
+
+        public FatalException(string message, Exception innerException) : base(message, innerException)
+        {
+            // This can't throw something like ArgumentException because that would be worse than
+            // throwing the fatal exception that was requested.
+            Fx.Assert(innerException == null || !Fx.IsFatal(innerException), "FatalException can't be used to wrap fatal exceptions.");
+        }
+        protected FatalException(SerializationInfo info, StreamingContext context) : base(info, context)
+        {
+        }
+    }
+}