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#’

(This was for a compiler built from the ghc-9.2 branch.)

I’d like to be able to do the same for HEAD.

I need to do this to help with the numerous tickets asking about library regressions.  For example, I want to be able repoduce @harendra’s example, but I can’t because I can’t build streamly.

Thanks!

Simon