https://www.graalvm.org/ 
public class com.oracle.truffle.api.test.polyglot.MIMETypeTest$MIMETypeLanguage3 extends com.oracle.truffle.api.test.polyglot.ProxyLanguage
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: com.oracle.truffle.api.test.polyglot.MIMETypeTest$MIMETypeLanguage3
  super_class: com.oracle.truffle.api.test.polyglot.ProxyLanguage
{
  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.test.polyglot.MIMETypeTest$MIMETypeLanguage3 this
         0: .line 110
            aload 0 /* this */
            invokespecial com.oracle.truffle.api.test.polyglot.ProxyLanguage.<init>:()V
            return
        end local 0 // com.oracle.truffle.api.test.polyglot.MIMETypeTest$MIMETypeLanguage3 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/test/polyglot/MIMETypeTest$MIMETypeLanguage3;
}
SourceFile: "MIMETypeTest.java"
NestHost: com.oracle.truffle.api.test.polyglot.MIMETypeTest
InnerClasses:
  public abstract Registration = com.oracle.truffle.api.TruffleLanguage$Registration of com.oracle.truffle.api.TruffleLanguage
  public MIMETypeLanguage3 = com.oracle.truffle.api.test.polyglot.MIMETypeTest$MIMETypeLanguage3 of com.oracle.truffle.api.test.polyglot.MIMETypeTest
    RuntimeVisibleAnnotations: 
      com.oracle.truffle.api.TruffleLanguage$Registration(id = "MIMETypeLanguage3", name = "", characterMimeTypes = {"text/test-js"})