Cannot request GHC 8 on Trusty, even though it is already installed

haskell
ghc

#1

Hi there,

My build at https://circleci.com/gh/lfairy/lfairy.github.io/86 fails with “unknown ghc version”.

However, according to the documentation, the Trusty build image (which I have enabled) has ghc-8.0.18.0.1-10~trusty pre-installed.

Removing the relevant lines from circle.yml does make it build again, but I’m not sure what version of GHC it uses now.

Does anyone know what’s going on here?

Thanks


#2

According to this build, the default version is indeed 8.0.1.

I’m guessing that the fact that GHC 8.0.1 is installed isn’t recorded in whatever applies the configuration.


#3