--- old/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/type/IllegalStamp.java	2019-03-12 08:08:43.683236022 +0100
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/type/IllegalStamp.java	2019-03-12 08:08:43.315233628 +0100
@@ -46,6 +46,10 @@
     }
 
     @Override
+    public void accept(Visitor v) {
+    }
+
+    @Override
     public JavaKind getStackKind() {
         return JavaKind.Illegal;
     }