#############################
Expected output for 'h5dump -H -d dset1 -d /dset2 --dataset=dset3 tdset.h5'
#############################
HDF5 "tdset.h5" {
DATASET "dset1" {
   DATATYPE  H5T_STD_I32BE
   DATASPACE  SIMPLE { ( 10, 20 ) / ( 10, 20 ) }
}
DATASET "/dset2" {
   DATATYPE  H5T_IEEE_F64BE
   DATASPACE  SIMPLE { ( 30, 20 ) / ( 30, 20 ) }
}
DATASET "dset3" {
   }
}
h5dump error: unable to open dataset "dset3"