https://www.graalvm.org/ 
final class org.graalvm.compiler.truffle.test.LibraryCompilationTest$FinalReceiver
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: org.graalvm.compiler.truffle.test.LibraryCompilationTest$FinalReceiver
  super_class: java.lang.Object
{
  void <init>();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.graalvm.compiler.truffle.test.LibraryCompilationTest$FinalReceiver this
         0: .line 68
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.graalvm.compiler.truffle.test.LibraryCompilationTest$FinalReceiver this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/graalvm/compiler/truffle/test/LibraryCompilationTest$FinalReceiver;

  java.lang.Object foldAsConstant();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.graalvm.compiler.truffle.test.LibraryCompilationTest$FinalReceiver this
         0: .line 72
            aload 0 /* this */
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            invokestatic com.oracle.truffle.api.CompilerAsserts.partialEvaluationConstant:(Ljava/lang/Object;)V
         1: .line 73
            ldc "FinalReceiver"
            areturn
        end local 0 // org.graalvm.compiler.truffle.test.LibraryCompilationTest$FinalReceiver this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/graalvm/compiler/truffle/test/LibraryCompilationTest$FinalReceiver;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
}
SourceFile: "LibraryCompilationTest.java"
NestHost: org.graalvm.compiler.truffle.test.LibraryCompilationTest
InnerClasses:
  final FinalReceiver = org.graalvm.compiler.truffle.test.LibraryCompilationTest$FinalReceiver of org.graalvm.compiler.truffle.test.LibraryCompilationTest
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportLibrary(value = Lorg/graalvm/compiler/truffle/test/LibraryCompilationTest$CompilationLibrary;)