[Haskell-cafe] Yesod devel issue: cannot satisfy -package-key main

[Geraldus]

I've had rebuild `yesod-bin` using same snapshot as in project, which was
selected as 6.27.  Otherwise `yesod devel` reported an error about compiler
version mismatch.  But default compiler is GHC 8, you're right.

I was able to resolve this doing `stack install --resolver=6.27` using
sources
from Git HEAD and removing `yesod` binary already installed in
~/.stack/snapshots/<arch>/lts-6.27/7.10.3/bin.

Thanks.
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