--- old/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/type/AbstractPointerStamp.java	2019-03-12 08:08:43.183232769 +0100
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/type/AbstractPointerStamp.java	2019-03-12 08:08:42.811230349 +0100
@@ -36,6 +36,12 @@
     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;