https://www.graalvm.org/ 
abstract class com.oracle.truffle.api.nodes.BlockNodeSnippets$LanguageNode extends com.oracle.truffle.api.nodes.Node
  minor version: 0
  major version: 59
  flags: flags: (0x0420) ACC_SUPER, ACC_ABSTRACT
  this_class: com.oracle.truffle.api.nodes.BlockNodeSnippets$LanguageNode
  super_class: com.oracle.truffle.api.nodes.Node
{
  final com.oracle.truffle.api.nodes.BlockNodeSnippets this$0;
    descriptor: Lcom/oracle/truffle/api/nodes/BlockNodeSnippets;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.oracle.truffle.api.nodes.BlockNodeSnippets);
    descriptor: (Lcom/oracle/truffle/api/nodes/BlockNodeSnippets;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.api.nodes.BlockNodeSnippets$LanguageNode this
         0: .line 439
            aload 0 /* this */
            aload 1
            putfield com.oracle.truffle.api.nodes.BlockNodeSnippets$LanguageNode.this$0:Lcom/oracle/truffle/api/nodes/BlockNodeSnippets;
            aload 0 /* this */
            invokespecial com.oracle.truffle.api.nodes.Node.<init>:()V
            return
        end local 0 // com.oracle.truffle.api.nodes.BlockNodeSnippets$LanguageNode this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/nodes/BlockNodeSnippets$LanguageNode;
    MethodParameters:
        Name  Flags
      this$0  final

  public abstract java.lang.Object execute(com.oracle.truffle.api.frame.VirtualFrame);
    descriptor: (Lcom/oracle/truffle/api/frame/VirtualFrame;)Ljava/lang/Object;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
       Name  Flags
      frame  
}
SourceFile: "BlockNode.java"
NestHost: com.oracle.truffle.api.nodes.BlockNodeSnippets
InnerClasses:
  abstract LanguageNode = com.oracle.truffle.api.nodes.BlockNodeSnippets$LanguageNode of com.oracle.truffle.api.nodes.BlockNodeSnippets