https://www.graalvm.org/ 
public final class com.oracle.truffle.api.dsl.test.examples.RubyCall$InternalMethod
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: com.oracle.truffle.api.dsl.test.examples.RubyCall$InternalMethod
  super_class: java.lang.Object
{
  public static final com.oracle.truffle.api.dsl.test.examples.RubyCall$InternalMethod METHOD_MISSING;
    descriptor: Lcom/oracle/truffle/api/dsl/test/examples/RubyCall$InternalMethod;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL

  private final com.oracle.truffle.api.CallTarget target;
    descriptor: Lcom/oracle/truffle/api/CallTarget;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=3, locals=0, args_size=0
         0: .line 303
            new com.oracle.truffle.api.dsl.test.examples.RubyCall$InternalMethod
            dup
            aconst_null
            invokespecial com.oracle.truffle.api.dsl.test.examples.RubyCall$InternalMethod.<init>:(Lcom/oracle/truffle/api/CallTarget;)V
            putstatic com.oracle.truffle.api.dsl.test.examples.RubyCall$InternalMethod.METHOD_MISSING:Lcom/oracle/truffle/api/dsl/test/examples/RubyCall$InternalMethod;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public void <init>(com.oracle.truffle.api.CallTarget);
    descriptor: (Lcom/oracle/truffle/api/CallTarget;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.api.dsl.test.examples.RubyCall$InternalMethod this
        start local 1 // com.oracle.truffle.api.CallTarget target
         0: .line 307
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 308
            aload 0 /* this */
            aload 1 /* target */
            putfield com.oracle.truffle.api.dsl.test.examples.RubyCall$InternalMethod.target:Lcom/oracle/truffle/api/CallTarget;
         2: .line 309
            return
        end local 1 // com.oracle.truffle.api.CallTarget target
        end local 0 // com.oracle.truffle.api.dsl.test.examples.RubyCall$InternalMethod this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    3     0    this  Lcom/oracle/truffle/api/dsl/test/examples/RubyCall$InternalMethod;
            0    3     1  target  Lcom/oracle/truffle/api/CallTarget;
    MethodParameters:
        Name  Flags
      target  

  public com.oracle.truffle.api.CallTarget getTarget();
    descriptor: ()Lcom/oracle/truffle/api/CallTarget;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.dsl.test.examples.RubyCall$InternalMethod this
         0: .line 312
            aload 0 /* this */
            getfield com.oracle.truffle.api.dsl.test.examples.RubyCall$InternalMethod.target:Lcom/oracle/truffle/api/CallTarget;
            areturn
        end local 0 // com.oracle.truffle.api.dsl.test.examples.RubyCall$InternalMethod this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/dsl/test/examples/RubyCall$InternalMethod;

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // com.oracle.truffle.api.dsl.test.examples.RubyCall$InternalMethod this
         0: .line 317
            new java.lang.StringBuilder
            dup
            ldc "InternalMethod[target="
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 0 /* this */
            invokevirtual com.oracle.truffle.api.dsl.test.examples.RubyCall$InternalMethod.getTarget:()Lcom/oracle/truffle/api/CallTarget;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder;
            ldc "]"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            areturn
        end local 0 // com.oracle.truffle.api.dsl.test.examples.RubyCall$InternalMethod this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/oracle/truffle/api/dsl/test/examples/RubyCall$InternalMethod;
}
SourceFile: "RubyCall.java"
NestHost: com.oracle.truffle.api.dsl.test.examples.RubyCall
InnerClasses:
  public final InternalMethod = com.oracle.truffle.api.dsl.test.examples.RubyCall$InternalMethod of com.oracle.truffle.api.dsl.test.examples.RubyCall