https://www.graalvm.org/ 
public final class com.oracle.truffle.js.nodes.promise.AsyncHandlerRootNode$AsyncStackTraceInfo
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: com.oracle.truffle.js.nodes.promise.AsyncHandlerRootNode$AsyncStackTraceInfo
  super_class: java.lang.Object
{
  public final com.oracle.truffle.api.object.DynamicObject promise;
    descriptor: Lcom/oracle/truffle/api/object/DynamicObject;
    flags: (0x0011) ACC_PUBLIC, ACC_FINAL

  public final com.oracle.truffle.api.TruffleStackTraceElement stackTraceElement;
    descriptor: Lcom/oracle/truffle/api/TruffleStackTraceElement;
    flags: (0x0011) ACC_PUBLIC, ACC_FINAL

  public void <init>(com.oracle.truffle.api.object.DynamicObject, com.oracle.truffle.api.TruffleStackTraceElement);
    descriptor: (Lcom/oracle/truffle/api/object/DynamicObject;Lcom/oracle/truffle/api/TruffleStackTraceElement;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // com.oracle.truffle.js.nodes.promise.AsyncHandlerRootNode$AsyncStackTraceInfo this
        start local 1 // com.oracle.truffle.api.object.DynamicObject promise
        start local 2 // com.oracle.truffle.api.TruffleStackTraceElement stackTraceElement
         0: .line 59
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 60
            aload 0 /* this */
            aload 1 /* promise */
            putfield com.oracle.truffle.js.nodes.promise.AsyncHandlerRootNode$AsyncStackTraceInfo.promise:Lcom/oracle/truffle/api/object/DynamicObject;
         2: .line 61
            aload 0 /* this */
            aload 2 /* stackTraceElement */
            putfield com.oracle.truffle.js.nodes.promise.AsyncHandlerRootNode$AsyncStackTraceInfo.stackTraceElement:Lcom/oracle/truffle/api/TruffleStackTraceElement;
         3: .line 62
            return
        end local 2 // com.oracle.truffle.api.TruffleStackTraceElement stackTraceElement
        end local 1 // com.oracle.truffle.api.object.DynamicObject promise
        end local 0 // com.oracle.truffle.js.nodes.promise.AsyncHandlerRootNode$AsyncStackTraceInfo this
      LocalVariableTable:
        Start  End  Slot               Name  Signature
            0    4     0               this  Lcom/oracle/truffle/js/nodes/promise/AsyncHandlerRootNode$AsyncStackTraceInfo;
            0    4     1            promise  Lcom/oracle/truffle/api/object/DynamicObject;
            0    4     2  stackTraceElement  Lcom/oracle/truffle/api/TruffleStackTraceElement;
    MethodParameters:
                   Name  Flags
      promise            
      stackTraceElement  

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.nodes.promise.AsyncHandlerRootNode$AsyncStackTraceInfo this
         0: .line 65
            aload 0 /* this */
            aconst_null
            aconst_null
            invokespecial com.oracle.truffle.js.nodes.promise.AsyncHandlerRootNode$AsyncStackTraceInfo.<init>:(Lcom/oracle/truffle/api/object/DynamicObject;Lcom/oracle/truffle/api/TruffleStackTraceElement;)V
         1: .line 66
            return
        end local 0 // com.oracle.truffle.js.nodes.promise.AsyncHandlerRootNode$AsyncStackTraceInfo this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/oracle/truffle/js/nodes/promise/AsyncHandlerRootNode$AsyncStackTraceInfo;
}
SourceFile: "AsyncHandlerRootNode.java"
NestHost: com.oracle.truffle.js.nodes.promise.AsyncHandlerRootNode
InnerClasses:
  public final AsyncStackTraceInfo = com.oracle.truffle.js.nodes.promise.AsyncHandlerRootNode$AsyncStackTraceInfo of com.oracle.truffle.js.nodes.promise.AsyncHandlerRootNode