HDF Group,

Could you please add a simple diagnostic feature to HDF5 1.8.20?  Current
1.8 utilities output unhelpful messages when trying to read newer format
hdf5 files made with more advanced library versions such as 1.10:

mac56:~/hdf5 20> ~/3rd/hdf5/1.8.20-pre1/bin/h5debug netcdf4.superblock-3.nc
cannot open file

mac56:~/hdf5 21> ~/3rd/hdf5/1.8.20-pre1/bin/h5dump netcdf4.superblock-3.nc
h5dump error: unable to open file "netcdf4.superblock-3.nc"

However, by your design, the superblock number is always located and
validated the same way in past and future versions.  Could you please amend
error messages to say more informative messages in these cases?  Such as
this two-line sequence:

h5debug error: unable to open file "netcdf4.superblock-3.nc"
Superblock version 3 is not supported in this software version

It would be nice if you could squeeze this into the 1.8.20 release.  Also
please add to the 1.10 branch; it will be helpful in the future.  Thank you.

--Dave
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