Lamp on IDL 8.8 fails to read the NeXus files
When trying to read a NeXus file from IN6 (but same happens with other instruments and unit tests), there is an error 'FREE_LUN: Variable is undefined: IN'. Trying to trace back the problem, I found that the function HDx_SD_SELECT returns a LONG in IDL 8.7 and a LONG64 in IDL 8.8. Note that IDL 8.8 has updated the HDF5 library to 1.10.5 (can this be the origin of the problem?)