$ ./pbc_info t/native_pbc/integer_2.pbc 
PackFile_unpack: This Parrot cannot read bytecode files with version 4.3.
./src/pmc/lexinfo.pmc:174: failed assertion 'v_type == enum_hash_int'
Backtrace - Obtained 20 stack frames (max trace depth is 32).
  (unknown)
    Parrot_confess
      Parrot_LexInfo_thaw
        (unknown)
          (unknown)
            Parrot_ParrotInterpreter_visit
              (unknown)
                (unknown)
                  Parrot_thaw
                    PackFile_Constant_unpack_pmc
                      PackFile_Constant_unpack
                        PackFile_ConstTable_unpack
                          PackFile_Segment_unpack
                            (unknown)
                              PackFile_Segment_unpack
                                PackFile_unpack
                                  Parrot_pbc_read
                                    (unknown)
                                      __libc_start_main
                                        (unknown)
Aborted