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

*** 44,53 ****
--- 44,57 ----
  
      private IllegalStamp() {
      }
  
      @Override
+     public void accept(Visitor v) {
+     }
+ 
+     @Override
      public JavaKind getStackKind() {
          return JavaKind.Illegal;
      }
  
      @Override