# System.Runtime.CompilerServices

``` diff
 namespace System.Runtime.CompilerServices {
+    public class CallConvSuppressGCTransition {
+        public CallConvSuppressGCTransition();
+    }
     public static class Unsafe {
+        public static ref T Add<T>(ref T source, UIntPtr elementOffset);
+        public static ref T AddByteOffset<T>(ref T source, UIntPtr byteOffset);
+        public static ref T Subtract<T>(ref T source, UIntPtr elementOffset);
+        public static ref T SubtractByteOffset<T>(ref T source, UIntPtr byteOffset);
     }
 }
```

