https://www.graalvm.org/ 
public interface com.oracle.truffle.api.nodes.NodeVisitor
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.oracle.truffle.api.nodes.NodeVisitor
  super_class: java.lang.Object
{
  public abstract boolean visit(com.oracle.truffle.api.nodes.Node);
    descriptor: (Lcom/oracle/truffle/api/nodes/Node;)Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
      Name  Flags
      node  
}
SourceFile: "NodeVisitor.java"