1. Compile the sample test.
2. Start jdb:
$ jdb -classpath . -XX:+EnableValhalla Test
3. Set breakpoint on the line with System.out.println()
> stop at Test:7
4. Run to breakpoint
> run
5. Invoke "print" cmd
>print varr[0]

Expected result:
[value class Test$MyValue, 11, d]

Actual result:
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00000001099f7144, pid=63994, tid=23555
#
# JRE version: OpenJDK Runtime Environment (12.0) (build 12-internal+0-adhoc.datitov.valhalla)
# Java VM: OpenJDK 64-Bit Server VM (12-internal+0-adhoc.datitov.valhalla, mixed mode, compressed oops, g1 gc, bsd-amd64)
# Problematic frame:
# V [libjvm.dylib+0x3f7144] jni_IsInstanceOf+0xa2
#
# No core dump will be written. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# An error report file with more information is saved as:
# /Users/datitov/src/valhalla/hs_err_pid63994.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#




================================
public class Test {

  public static void main(String[] args){

    MyValue[] varr = new MyValue[2];
    varr[0] = new MyValue(11,'d');
    System.out.println("v = " + varr[0]);
  }

  public final __ByValue static class MyValue {
      int a;
      char b;

      public MyValue(int a, char b) {
        this.a = a;
        this.b = b;
      }
  }
}