https://www.graalvm.org/ 
public class com.oracle.truffle.api.debug.test.DebuggerRetrievalLegacyTest$LanguageThatNeedsDebuggerLegacy extends com.oracle.truffle.api.TruffleLanguage<com.oracle.truffle.api.debug.Debugger>
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: com.oracle.truffle.api.debug.test.DebuggerRetrievalLegacyTest$LanguageThatNeedsDebuggerLegacy
  super_class: com.oracle.truffle.api.TruffleLanguage
{
  static final java.lang.String ID;
    descriptor: Ljava/lang/String;
    flags: (0x0018) ACC_STATIC, ACC_FINAL
    ConstantValue: "language-that-needs-debugger-legacy"

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.debug.test.DebuggerRetrievalLegacyTest$LanguageThatNeedsDebuggerLegacy this
         0: .line 83
            aload 0 /* this */
            invokespecial com.oracle.truffle.api.TruffleLanguage.<init>:()V
            return
        end local 0 // com.oracle.truffle.api.debug.test.DebuggerRetrievalLegacyTest$LanguageThatNeedsDebuggerLegacy this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/debug/test/DebuggerRetrievalLegacyTest$LanguageThatNeedsDebuggerLegacy;

  protected com.oracle.truffle.api.debug.Debugger createContext(com.oracle.truffle.api.TruffleLanguage$Env);
    descriptor: (Lcom/oracle/truffle/api/TruffleLanguage$Env;)Lcom/oracle/truffle/api/debug/Debugger;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=3, locals=4, args_size=2
        start local 0 // com.oracle.truffle.api.debug.test.DebuggerRetrievalLegacyTest$LanguageThatNeedsDebuggerLegacy this
        start local 1 // com.oracle.truffle.api.TruffleLanguage$Env env
         0: .line 89
            aload 1 /* env */
            invokevirtual com.oracle.truffle.api.TruffleLanguage$Env.getInstruments:()Ljava/util/Map;
            ldc "debugger"
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast com.oracle.truffle.api.InstrumentInfo
            astore 2 /* debuggerInfo */
        start local 2 // com.oracle.truffle.api.InstrumentInfo debuggerInfo
         1: .line 90
            aload 1 /* env */
            aload 2 /* debuggerInfo */
            ldc Lcom/oracle/truffle/api/debug/Debugger;
            invokevirtual com.oracle.truffle.api.TruffleLanguage$Env.lookup:(Lcom/oracle/truffle/api/InstrumentInfo;Ljava/lang/Class;)Ljava/lang/Object;
            checkcast com.oracle.truffle.api.debug.Debugger
            astore 3 /* debugger */
        start local 3 // com.oracle.truffle.api.debug.Debugger debugger
         2: .line 91
            aload 3 /* debugger */
            aload 1 /* env */
            invokestatic com.oracle.truffle.api.debug.Debugger.find:(Lcom/oracle/truffle/api/TruffleLanguage$Env;)Lcom/oracle/truffle/api/debug/Debugger;
            invokestatic org.junit.Assert.assertEquals:(Ljava/lang/Object;Ljava/lang/Object;)V
         3: .line 92
            aload 3 /* debugger */
            areturn
        end local 3 // com.oracle.truffle.api.debug.Debugger debugger
        end local 2 // com.oracle.truffle.api.InstrumentInfo debuggerInfo
        end local 1 // com.oracle.truffle.api.TruffleLanguage$Env env
        end local 0 // com.oracle.truffle.api.debug.test.DebuggerRetrievalLegacyTest$LanguageThatNeedsDebuggerLegacy this
      LocalVariableTable:
        Start  End  Slot          Name  Signature
            0    4     0          this  Lcom/oracle/truffle/api/debug/test/DebuggerRetrievalLegacyTest$LanguageThatNeedsDebuggerLegacy;
            0    4     1           env  Lcom/oracle/truffle/api/TruffleLanguage$Env;
            1    4     2  debuggerInfo  Lcom/oracle/truffle/api/InstrumentInfo;
            2    4     3      debugger  Lcom/oracle/truffle/api/debug/Debugger;
    MethodParameters:
      Name  Flags
      env   

  protected java.lang.Iterable<com.oracle.truffle.api.Scope> findTopScopes(com.oracle.truffle.api.debug.Debugger);
    descriptor: (Lcom/oracle/truffle/api/debug/Debugger;)Ljava/lang/Iterable;
    flags: (0x0004) ACC_PROTECTED
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // com.oracle.truffle.api.debug.test.DebuggerRetrievalLegacyTest$LanguageThatNeedsDebuggerLegacy this
        start local 1 // com.oracle.truffle.api.debug.Debugger context
         0: .line 98
            ldc "Debugger top scope"
            new com.oracle.truffle.api.debug.test.DebuggerRetrievalLegacyTest$LanguageThatNeedsDebuggerLegacy$TopScopeObjectLegacy
            dup
            aload 1 /* context */
            invokespecial com.oracle.truffle.api.debug.test.DebuggerRetrievalLegacyTest$LanguageThatNeedsDebuggerLegacy$TopScopeObjectLegacy.<init>:(Lcom/oracle/truffle/api/debug/Debugger;)V
            invokestatic com.oracle.truffle.api.Scope.newBuilder:(Ljava/lang/String;Ljava/lang/Object;)Lcom/oracle/truffle/api/Scope$Builder;
            invokevirtual com.oracle.truffle.api.Scope$Builder.build:()Lcom/oracle/truffle/api/Scope;
            invokestatic java.util.Collections.singleton:(Ljava/lang/Object;)Ljava/util/Set;
            areturn
        end local 1 // com.oracle.truffle.api.debug.Debugger context
        end local 0 // com.oracle.truffle.api.debug.test.DebuggerRetrievalLegacyTest$LanguageThatNeedsDebuggerLegacy this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    1     0     this  Lcom/oracle/truffle/api/debug/test/DebuggerRetrievalLegacyTest$LanguageThatNeedsDebuggerLegacy;
            0    1     1  context  Lcom/oracle/truffle/api/debug/Debugger;
    Signature: (Lcom/oracle/truffle/api/debug/Debugger;)Ljava/lang/Iterable<Lcom/oracle/truffle/api/Scope;>;
    MethodParameters:
         Name  Flags
      context  

  protected java.lang.Object createContext(com.oracle.truffle.api.TruffleLanguage$Env);
    descriptor: (Lcom/oracle/truffle/api/TruffleLanguage$Env;)Ljava/lang/Object;
    flags: (0x1044) ACC_PROTECTED, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            invokevirtual com.oracle.truffle.api.debug.test.DebuggerRetrievalLegacyTest$LanguageThatNeedsDebuggerLegacy.createContext:(Lcom/oracle/truffle/api/TruffleLanguage$Env;)Lcom/oracle/truffle/api/debug/Debugger;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  protected java.lang.Iterable findTopScopes(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Ljava/lang/Iterable;
    flags: (0x1044) ACC_PROTECTED, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            checkcast com.oracle.truffle.api.debug.Debugger
            invokevirtual com.oracle.truffle.api.debug.test.DebuggerRetrievalLegacyTest$LanguageThatNeedsDebuggerLegacy.findTopScopes:(Lcom/oracle/truffle/api/debug/Debugger;)Ljava/lang/Iterable;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: Lcom/oracle/truffle/api/TruffleLanguage<Lcom/oracle/truffle/api/debug/Debugger;>;
SourceFile: "DebuggerRetrievalLegacyTest.java"
NestHost: com.oracle.truffle.api.debug.test.DebuggerRetrievalLegacyTest
InnerClasses:
  public final Builder = com.oracle.truffle.api.Scope$Builder of com.oracle.truffle.api.Scope
  public final Env = com.oracle.truffle.api.TruffleLanguage$Env of com.oracle.truffle.api.TruffleLanguage
  public abstract Registration = com.oracle.truffle.api.TruffleLanguage$Registration of com.oracle.truffle.api.TruffleLanguage
  public LanguageThatNeedsDebuggerLegacy = com.oracle.truffle.api.debug.test.DebuggerRetrievalLegacyTest$LanguageThatNeedsDebuggerLegacy of com.oracle.truffle.api.debug.test.DebuggerRetrievalLegacyTest
  final TopScopeObjectLegacy = com.oracle.truffle.api.debug.test.DebuggerRetrievalLegacyTest$LanguageThatNeedsDebuggerLegacy$TopScopeObjectLegacy of com.oracle.truffle.api.debug.test.DebuggerRetrievalLegacyTest$LanguageThatNeedsDebuggerLegacy
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.TruffleLanguage$Registration(id = "language-that-needs-debugger-legacy", name = "Language That Needs Debugger", version = "1.0")