ghc-docker-dev
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#12, use debian testing repo in addition to being the base system
use debian testing repo in addition to being the base system. The testing system of today has the required version of happy, but "stretch" doesn't
hm, it seems I've misunderstood the docker file in my change so it probably doesn't fix the problem. So I wonder, why is happy < 1.19.10 in the image?
so perhaps this pull request isn't the right thing to do - at least not without the haskell.org repos being updated first. Perhaps a mere rebuild is required