src/share/classes/sun/reflect/generics/tree/VoidDescriptor.java

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@@ -28,11 +28,11 @@
 import sun.reflect.generics.visitor.TypeTreeVisitor;
 
 
 /** AST that represents the pseudo-type void. */
 public class VoidDescriptor implements ReturnType {
-    private static VoidDescriptor singleton = new VoidDescriptor();
+    private static final VoidDescriptor singleton = new VoidDescriptor();
 
     private VoidDescriptor(){}
 
     public static VoidDescriptor make() {return singleton;}