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Joey Hess authored
cabal exec will sometimes output other messages to stdout, which broke the build. It used to be intermittent in CI, now seems to always happen. Messages are eg "Resolving dependencies..." It seems that cabal list-bin never does this. I hope. cabal list-bin is fairly new, needing cabal 3.8, which is only in Debian testing/unstable. So fall back to cabal exec if it fails.