https://www.graalvm.org/ 
class com.oracle.truffle.polyglot.PolyglotExceptionImpl$1 implements java.lang.Iterable<org.graalvm.polyglot.PolyglotException$StackFrame>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.polyglot.PolyglotExceptionImpl$1
  super_class: java.lang.Object
{
  final com.oracle.truffle.polyglot.PolyglotExceptionImpl this$0;
    descriptor: Lcom/oracle/truffle/polyglot/PolyglotExceptionImpl;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.oracle.truffle.polyglot.PolyglotExceptionImpl);
    descriptor: (Lcom/oracle/truffle/polyglot/PolyglotExceptionImpl;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.polyglot.PolyglotExceptionImpl$1 this
         0: .line 406
            aload 0 /* this */
            aload 1
            putfield com.oracle.truffle.polyglot.PolyglotExceptionImpl$1.this$0:Lcom/oracle/truffle/polyglot/PolyglotExceptionImpl;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // com.oracle.truffle.polyglot.PolyglotExceptionImpl$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/polyglot/PolyglotExceptionImpl$1;
    MethodParameters:
        Name  Flags
      this$0  final

  public java.util.Iterator<org.graalvm.polyglot.PolyglotException$StackFrame> iterator();
    descriptor: ()Ljava/util/Iterator;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.polyglot.PolyglotExceptionImpl$1 this
         0: .line 408
            aload 0 /* this */
            getfield com.oracle.truffle.polyglot.PolyglotExceptionImpl$1.this$0:Lcom/oracle/truffle/polyglot/PolyglotExceptionImpl;
            invokestatic com.oracle.truffle.polyglot.PolyglotExceptionImpl.createStackFrameIterator:(Lcom/oracle/truffle/polyglot/PolyglotExceptionImpl;)Ljava/util/Iterator;
            areturn
        end local 0 // com.oracle.truffle.polyglot.PolyglotExceptionImpl$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/polyglot/PolyglotExceptionImpl$1;
    Signature: ()Ljava/util/Iterator<Lorg/graalvm/polyglot/PolyglotException$StackFrame;>;
}
Signature: Ljava/lang/Object;Ljava/lang/Iterable<Lorg/graalvm/polyglot/PolyglotException$StackFrame;>;
SourceFile: "PolyglotExceptionImpl.java"
EnclosingMethod: com.oracle.truffle.polyglot.PolyglotExceptionImpl.getPolyglotStackTrace:()Ljava/lang/Iterable;
NestHost: com.oracle.truffle.polyglot.PolyglotExceptionImpl
InnerClasses:
  com.oracle.truffle.polyglot.PolyglotExceptionImpl$1
  public final StackFrame = org.graalvm.polyglot.PolyglotException$StackFrame of org.graalvm.polyglot.PolyglotException