Hello devs, Wiki page on testing says that in order to run all tests you have to install additional packages: https://ghc.haskell.org/trac/ghc/wiki/Building/RunningTests/Running#Addition... and kindly provides a command to do this: cabal install --with-compiler=`pwd`/inplace/bin/ghc-stage2 --package-db=`pwd`/inplace/lib/package.conf.d mtl parallel parsec primitive QuickCheck random regex-compat syb stm utf8-string vector After the af9b744bb https://github.com/ghc/ghc/commit/af9b744bbf1c39078e561b19edd3c5234b361b27 one of the packages, primitive, does not build anymore. At least, its last released version on Hackage. I see that the problem has been fixed on primitive's master (a2af610 https://github.com/haskell/primitive/commit/a2af610c08c5f5afc496f907bf6b2a4b...). But what should I do to actually test master branch of GHC now? -- Best wishes, Artem