I expect `hp2ps -cd` to work as `hp2ps -c -d` does.
It's a common convention among command-line programs that if the documentation describes short options, such as
-d then it should also accept their combination like
-cd, unless otherwise stated.
Alternatively, if this is not supported, then at least a warning abound unknown option "cd" should be displayed.
Instead the process silently accepts
-cd, and produces a colorful chart (-c) but does not sort by variance (ignores d).
I'm not sure what version of hp2ps I use, because it seems to ignore
--help does not produce version string anywhere.
However: $ ghc --version The Glorious Glasgow Haskell Compilation System, version 7.10.2