[Haskell-beginners] How to use earlier ghc version with stack

[stevix at zoho.com]

I'm going through a book on Haskell that is based on a ghc version between 7.8 and 8.0

I created a new project using the default settings and have a much more recent version of ghc installed

How to I fall back to an earlier version?

Using haskell stack on manjaro linux

Steve
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.haskell.org/pipermail/beginners/attachments/20190402/bb84237c/attachment.html>