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

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@@ -27,11 +27,11 @@
 
 import sun.reflect.generics.visitor.TypeTreeVisitor;
 
 /** AST that represents the type char. */
 public class CharSignature implements BaseType {
-    private static CharSignature singleton = new CharSignature();
+    private static final CharSignature singleton = new CharSignature();
 
     private CharSignature(){}
 
     public static CharSignature make() {return singleton;}