It is desirable to have an enumeration of values that might end up in Sys.Info.os and Sys.Info.arch. Only after much reading of Cabal files and such have I learnt that the former includes (at least) linux, darwin, windows and freebsd. (And not, for example, win32.)

This is only a minor annoyance and I will likely never need to bother with it again -- though I guess I'm still not sure what Solaris is called -- probably solaris -- I've got the pattern now, but it would have been much better to see a list.