When following the example usage of IRStream in bin/examples/load_root_file_cpp/load_root_file.cc, the first spill of every root file is skipped.

This can be avoided by extracting the first spill branch before using the loadEvent manipulator - but you lose the elegant usage of the class and there is no intrinsic way to check the file integrity before attempting to load data.

I'm not sure if an improved example or a tweak to the implementation would be a better fix.