https://www.graalvm.org/ 
interface com.oracle.truffle.api.nodes.NodeClassImpl$NodeFieldFilter
  minor version: 0
  major version: 59
  flags: flags: (0x0600) ACC_INTERFACE, ACC_ABSTRACT
  this_class: com.oracle.truffle.api.nodes.NodeClassImpl$NodeFieldFilter
  super_class: java.lang.Object
{
  public abstract boolean test(com.oracle.truffle.api.nodes.NodeFieldAccessor);
    descriptor: (Lcom/oracle/truffle/api/nodes/NodeFieldAccessor;)Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
       Name  Flags
      field  
}
SourceFile: "NodeClassImpl.java"
NestHost: com.oracle.truffle.api.nodes.NodeClassImpl
InnerClasses:
  private abstract NodeFieldFilter = com.oracle.truffle.api.nodes.NodeClassImpl$NodeFieldFilter of com.oracle.truffle.api.nodes.NodeClassImpl