Hi, Following up my own message about problems compiling Fudgets with Yhc. An instance Functor Maybe was missing, and I tried to add it to Prelude (where both Functor and Maybe are defined, to avoid orphan instance issues). It turns out, every time Prelude.hs is recompiled, its interface file is overwritten with one from bootstrap. What is the purpose of this? I'd assume the opposite: if Prelude got recompiled, the bootstrap interface has to be updated, so one getting a clean distribution would have prelude interface intact. Is this an error in SConscript? Or am I missing something? For now, I just commented out three lines in SConscript responsible for the yhc-base package compilation. The new instance is now visible. I haven't committed this to the central repo; I'd like to get some explanation of this first. Thanks On 1/10/07, Neil Mitchell wrote:

Dimitry,

Apparently there are problems with orphan instances, and perhaps passing -prelude when compiling the file with the instance in it will work. If that doesn't work email the list, since its probably an nhc issue originally. -- Dimitry Golubovsky

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