cardano-haskell-packages
                                
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                        Come up with a better way of excluding packages that can't build on a particular GHC
This is very common, and we're likely to be in situations where most packages won't build with that version, e.g. when we do https://github.com/input-output-hk/cardano-haskell-packages/issues/173.
So we want some way of doing this that doesn't require manually listing out every version that doesn't work!
We could check the tested-with cabal meta data.
Yeah, that could potentially work. Also we can fix that up with metadata revisions, which is nice. I don't know if we have a nice way to read it, though.