Part of the problem seems to do with 218 newtypes that I have in one module that I'm importing and about 30 newtype/data in another imported module. I moved just 7 HList types into a separate module but still could not compile. I then tried just 4 and then just 2 and still no dice. This makes me think that the problem could be somewhere else. Could it have to do with HList enabling overlapped and undecided instances and ghc not being able to decide something? On Nov 9, 2005, at 4:06 PM, Joel Reymont wrote:
Folks,
I'm on Mac OSX 10.4.3 with 1Gb of memory and GHC 6.4.1. I'm using HList to define 92 structures in a module. I'm not using classes.
There's some nesting going on (see below). Few datypes above are data, mostly they are newtypes around Word32s, Strings, and lists of those. I have 40 newtypes that wrap HLists and homogeneous lists of HList types, 52 are type aliases around HLists.
Both with and without -O ghc cannot compile my module. I run out of physical memory within 2-3 minutes and then it's just swapping (I think) and the system becomes totally unresponsive.