"Neil Mitchell"
1. I compile HelloWorld.hs by "yhc HelloWorld" and it works fine. However, in contrast to the description on http://haskell.org/haskellwiki/Yhc/Tutorial, the result is deposited in Main.hbc and Main.hi, so to run it, I must use "yhi Main". "yhi HelloWorld" produces a complaint (ERROR: couldn't find module named 'HelloWorld').
GHC has the same behaviour, at least on Windows, producing main.exe always.
And this behaviour was equally annoying under ghc! It was widely regarded as a bug, and I'm glad to say it is now fixed with ghc-6.6.
5. Getting to some more meaty things, actually compiling some code, I get the message "Error: Context for Prelude.Num needed in left hand pattern at 98:19-98:23."
Sounds like an nhc bug that carried over. I'll open a bug report for it.
Yep, it is an old bug, noted for ages on the nhc98 webpages. It has something to do with the (lack of the) monomorphism restriction. Regards, Malcolm