src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/type/AbstractPointerStamp.java

*** 34,43 ****
--- 34,49 ----
  public abstract class AbstractPointerStamp extends Stamp {
  
      private final boolean nonNull;
      private final boolean alwaysNull;
  
+     @Override
+     public void accept(Visitor v) {
+         v.visitBoolean(nonNull);
+         v.visitBoolean(alwaysNull);
+     }
+ 
      protected AbstractPointerStamp(boolean nonNull, boolean alwaysNull) {
          this.nonNull = nonNull;
          this.alwaysNull = alwaysNull;
      }