https://www.graalvm.org/ 
class com.oracle.truffle.api.dsl.test.issue20854.Issue20854Test extends com.oracle.truffle.api.dsl.test.issue20854.BaseType
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: com.oracle.truffle.api.dsl.test.issue20854.Issue20854Test
  super_class: com.oracle.truffle.api.dsl.test.issue20854.BaseType
{
  void <init>();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.dsl.test.issue20854.Issue20854Test this
         0: .line 57
            aload 0 /* this */
            invokespecial com.oracle.truffle.api.dsl.test.issue20854.BaseType.<init>:()V
            return
        end local 0 // com.oracle.truffle.api.dsl.test.issue20854.Issue20854Test this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/dsl/test/issue20854/Issue20854Test;

  public boolean isExecutable();
    descriptor: ()Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.dsl.test.issue20854.Issue20854Test this
         0: .line 61
            iconst_0
            ireturn
        end local 0 // com.oracle.truffle.api.dsl.test.issue20854.Issue20854Test this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/dsl/test/issue20854/Issue20854Test;
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()

  java.lang.Object execute(java.lang.Object[]);
    descriptor: ([Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0000) 
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // com.oracle.truffle.api.dsl.test.issue20854.Issue20854Test this
        start local 1 // java.lang.Object[] args
         0: .line 66
            invokestatic com.oracle.truffle.api.interop.UnsupportedMessageException.create:()Lcom/oracle/truffle/api/interop/UnsupportedMessageException;
            athrow
        end local 1 // java.lang.Object[] args
        end local 0 // com.oracle.truffle.api.dsl.test.issue20854.Issue20854Test this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/dsl/test/issue20854/Issue20854Test;
            0    1     1  args  [Ljava/lang/Object;
    Exceptions:
      throws com.oracle.truffle.api.interop.UnsupportedMessageException
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportMessage()
    MethodParameters:
      Name  Flags
      args  
}
SourceFile: "Issue20854Test.java"
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.library.ExportLibrary(value = Lcom/oracle/truffle/api/interop/InteropLibrary;)