https://www.graalvm.org/ 
class com.oracle.truffle.object.ConsListPropertyMap$4$1 implements java.util.Iterator<java.util.Map$Entry<java.lang.Object, com.oracle.truffle.api.object.Property>>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.object.ConsListPropertyMap$4$1
  super_class: java.lang.Object
{
  com.oracle.truffle.object.ConsListPropertyMap current;
    descriptor: Lcom/oracle/truffle/object/ConsListPropertyMap;
    flags: (0x0000) 

  final com.oracle.truffle.object.ConsListPropertyMap$4 this$1;
    descriptor: Lcom/oracle/truffle/object/ConsListPropertyMap$4;
    flags: (0x1010) ACC_FINAL, ACC_SYNTHETIC

  void <init>(com.oracle.truffle.object.ConsListPropertyMap$4);
    descriptor: (Lcom/oracle/truffle/object/ConsListPropertyMap$4;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.object.ConsListPropertyMap$4$1 this
         0: .line 192
            aload 0 /* this */
            aload 1
            putfield com.oracle.truffle.object.ConsListPropertyMap$4$1.this$1:Lcom/oracle/truffle/object/ConsListPropertyMap$4;
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 193
            aload 0 /* this */
            aload 1
            invokestatic com.oracle.truffle.object.ConsListPropertyMap$4.access$0:(Lcom/oracle/truffle/object/ConsListPropertyMap$4;)Lcom/oracle/truffle/object/ConsListPropertyMap;
            putfield com.oracle.truffle.object.ConsListPropertyMap$4$1.current:Lcom/oracle/truffle/object/ConsListPropertyMap;
         2: .line 192
            return
        end local 0 // com.oracle.truffle.object.ConsListPropertyMap$4$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/oracle/truffle/object/ConsListPropertyMap$4$1;
    MethodParameters:
        Name  Flags
      this$0  final

  public java.util.Map$Entry<java.lang.Object, com.oracle.truffle.api.object.Property> next();
    descriptor: ()Ljava/util/Map$Entry;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=1
        start local 0 // com.oracle.truffle.object.ConsListPropertyMap$4$1 this
         0: .line 196
            aload 0 /* this */
            invokevirtual com.oracle.truffle.object.ConsListPropertyMap$4$1.hasNext:()Z
            ifeq 7
         1: .line 198
            new com.oracle.truffle.object.ConsListPropertyMap$MapEntryImpl
            dup
            aload 0 /* this */
            getfield com.oracle.truffle.object.ConsListPropertyMap$4$1.current:Lcom/oracle/truffle/object/ConsListPropertyMap;
            getfield com.oracle.truffle.object.ConsListPropertyMap.cdr:Lcom/oracle/truffle/api/object/Property;
            invokespecial com.oracle.truffle.object.ConsListPropertyMap$MapEntryImpl.<init>:(Lcom/oracle/truffle/api/object/Property;)V
            astore 2
         2: .line 200
            aload 0 /* this */
            aload 0 /* this */
            getfield com.oracle.truffle.object.ConsListPropertyMap$4$1.current:Lcom/oracle/truffle/object/ConsListPropertyMap;
            getfield com.oracle.truffle.object.ConsListPropertyMap.car:Lcom/oracle/truffle/object/ConsListPropertyMap;
            putfield com.oracle.truffle.object.ConsListPropertyMap$4$1.current:Lcom/oracle/truffle/object/ConsListPropertyMap;
         3: .line 198
            aload 2
            areturn
         4: .line 199
      StackMap locals:
      StackMap stack: java.lang.Throwable
            astore 1
         5: .line 200
            aload 0 /* this */
            aload 0 /* this */
            getfield com.oracle.truffle.object.ConsListPropertyMap$4$1.current:Lcom/oracle/truffle/object/ConsListPropertyMap;
            getfield com.oracle.truffle.object.ConsListPropertyMap.car:Lcom/oracle/truffle/object/ConsListPropertyMap;
            putfield com.oracle.truffle.object.ConsListPropertyMap$4$1.current:Lcom/oracle/truffle/object/ConsListPropertyMap;
         6: .line 201
            aload 1
            athrow
         7: .line 203
      StackMap locals:
      StackMap stack:
            new java.util.NoSuchElementException
            dup
            invokespecial java.util.NoSuchElementException.<init>:()V
            athrow
        end local 0 // com.oracle.truffle.object.ConsListPropertyMap$4$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    8     0  this  Lcom/oracle/truffle/object/ConsListPropertyMap$4$1;
      Exception table:
        from    to  target  type
           1     2       4  any
    Signature: ()Ljava/util/Map$Entry<Ljava/lang/Object;Lcom/oracle/truffle/api/object/Property;>;

  public boolean hasNext();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.oracle.truffle.object.ConsListPropertyMap$4$1 this
         0: .line 208
            aload 0 /* this */
            getfield com.oracle.truffle.object.ConsListPropertyMap$4$1.current:Lcom/oracle/truffle/object/ConsListPropertyMap;
            invokestatic com.oracle.truffle.object.ConsListPropertyMap.empty:()Lcom/oracle/truffle/object/ConsListPropertyMap;
            if_acmpeq 1
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         1: iconst_0
            ireturn
        end local 0 // com.oracle.truffle.object.ConsListPropertyMap$4$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/oracle/truffle/object/ConsListPropertyMap$4$1;

  public void remove();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.oracle.truffle.object.ConsListPropertyMap$4$1 this
         0: .line 212
            new java.lang.UnsupportedOperationException
            dup
            invokespecial java.lang.UnsupportedOperationException.<init>:()V
            athrow
        end local 0 // com.oracle.truffle.object.ConsListPropertyMap$4$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/object/ConsListPropertyMap$4$1;

  public java.lang.Object next();
    descriptor: ()Ljava/lang/Object;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 1
            aload 0
            invokevirtual com.oracle.truffle.object.ConsListPropertyMap$4$1.next:()Ljava/util/Map$Entry;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: Ljava/lang/Object;Ljava/util/Iterator<Ljava/util/Map$Entry<Ljava/lang/Object;Lcom/oracle/truffle/api/object/Property;>;>;
SourceFile: "ConsListPropertyMap.java"
EnclosingMethod: com.oracle.truffle.object.ConsListPropertyMap$4.iterator:()Ljava/util/Iterator;
NestHost: com.oracle.truffle.object.ConsListPropertyMap
InnerClasses:
  com.oracle.truffle.object.ConsListPropertyMap$4
  com.oracle.truffle.object.ConsListPropertyMap$4$1
  private final MapEntryImpl = com.oracle.truffle.object.ConsListPropertyMap$MapEntryImpl of com.oracle.truffle.object.ConsListPropertyMap
  public abstract Entry = java.util.Map$Entry of java.util.Map