Simon Peyton Jones via ghc-devs
Ben and other friends What is the approved way to build libraries with (and for) a compiler that I've just built? I tried this:
bash$ cabal v2-install --with-ghc=/home/simonpj/code/ghc-9.2-branch/inplace/bin/ghc-stage2 streamly --allow-newer but it failed with
Data/Primitive/Types.hs:273:844: error:
* Couldn't match expected type 'Word#' with actual type 'Word8#'
* In the fourth argument of 'shimmedSetWord8Array#', namely 'x#'
As noted by others, we maintain head.hackage for precisely this reason. It's not perfect, but I use it regularly to build Hackage packages with pre-releases. I have a draft blog post (which sadly has run into technical challenges which have prevented publishing) which describes usage [1]. Cheers, - Ben [1] https://gitlab.haskell.org/ghc/homepage/-/merge_requests/29