https://www.graalvm.org/ 
public class com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest extends com.oracle.truffle.api.test.polyglot.AbstractPolyglotTest
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest
  super_class: com.oracle.truffle.api.test.polyglot.AbstractPolyglotTest
{
  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest this
         0: .line 73
            aload 0 /* this */
            invokespecial com.oracle.truffle.api.test.polyglot.AbstractPolyglotTest.<init>:()V
            return
        end local 0 // com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/instrumentation/test/FindSourcesVisitorNestingTest;

  public void setup();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest this
         0: .line 211
            aload 0 /* this */
            iconst_0
            anewarray java.lang.String
            invokestatic org.graalvm.polyglot.Context.create:([Ljava/lang/String;)Lorg/graalvm/polyglot/Context;
            new com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest$1
            dup
            aload 0 /* this */
            invokespecial com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest$1.<init>:(Lcom/oracle/truffle/api/instrumentation/test/FindSourcesVisitorNestingTest;)V
            invokevirtual com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest.setupEnv:(Lorg/graalvm/polyglot/Context;Lcom/oracle/truffle/api/test/polyglot/ProxyLanguage;)V
         1: .line 236
            return
        end local 0 // com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/oracle/truffle/api/instrumentation/test/FindSourcesVisitorNestingTest;
    RuntimeVisibleAnnotations: 
      org.junit.Before()

  public void testFindSourcesVisitorNesting();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=1
        start local 0 // com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest this
         0: .line 240
            ldc "proxyLanguage"
            ldc ""
            invokestatic org.graalvm.polyglot.Source.create:(Ljava/lang/String;Ljava/lang/CharSequence;)Lorg/graalvm/polyglot/Source;
            astore 1 /* source */
        start local 1 // org.graalvm.polyglot.Source source
         1: .line 241
            ldc "Retired dummy instrumentable node was not added an instrumentation wrapper!"
            aload 0 /* this */
            getfield com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest.context:Lorg/graalvm/polyglot/Context;
            aload 1 /* source */
            invokevirtual org.graalvm.polyglot.Context.eval:(Lorg/graalvm/polyglot/Source;)Lorg/graalvm/polyglot/Value;
            invokevirtual org.graalvm.polyglot.Value.asBoolean:()Z
            invokestatic org.junit.Assert.assertTrue:(Ljava/lang/String;Z)V
         2: .line 242
            return
        end local 1 // org.graalvm.polyglot.Source source
        end local 0 // com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    3     0    this  Lcom/oracle/truffle/api/instrumentation/test/FindSourcesVisitorNestingTest;
            1    3     1  source  Lorg/graalvm/polyglot/Source;
    RuntimeVisibleAnnotations: 
      org.junit.Test()

  static com.oracle.truffle.api.instrumentation.TruffleInstrument$Env access$0(com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest);
    descriptor: (Lcom/oracle/truffle/api/instrumentation/test/FindSourcesVisitorNestingTest;)Lcom/oracle/truffle/api/instrumentation/TruffleInstrument$Env;
    flags: (0x1008) ACC_STATIC, ACC_SYNTHETIC
    Code:
      stack=1, locals=1, args_size=1
         0: .line 73
            aload 0
            getfield com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest.instrumentEnv:Lcom/oracle/truffle/api/instrumentation/TruffleInstrument$Env;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
SourceFile: "FindSourcesVisitorNestingTest.java"
NestMembers:
  com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest$1  com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest$1$1  com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest$CreateCallTargetOnMaterializeNode  com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest$CreateCallTargetOnMaterializeNode$1  com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest$CreateCallTargetOnMaterializeNode$2  com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest$DummyInstrumentableNode
InnerClasses:
  public final Env = com.oracle.truffle.api.instrumentation.TruffleInstrument$Env of com.oracle.truffle.api.instrumentation.TruffleInstrument
  com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest$1
  CreateCallTargetOnMaterializeNode = com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest$CreateCallTargetOnMaterializeNode of com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest
  DummyInstrumentableNode = com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest$DummyInstrumentableNode of com.oracle.truffle.api.instrumentation.test.FindSourcesVisitorNestingTest