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Update to handle Cabal 3.4 (Dependency 3rd arg is new NonEmptySet). #12
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sternenseemann
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Jun 10, 2021
Stackage Nighly recently upgraded their version of hackage-db from 2.1.0 to 2.1.1. 2.1.1 had a compatibility fix for Cabal 3.4 [1]. However it did not increase the version bound on Cabal nor fails to compile with Cabal 3.2, so Stackage was able to update it. Unfortunately hackage-db with Cabal 3.2 causes observable issues [2] in cabal2nix, so we need to downgrade it for all compilers that still ship a Cabal version < 3.4. Also ideally we should update the constraints for hackage-db 2.1.0 and hackage-db 2.1.1 on hackage. See also [3]. [1]: NixOS/hackage-db#12 [2]: NixOS/cabal2nix#501 [3]: NixOS/hackage-db#14
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This causes NixOS/cabal2nix#501, since the version constraint string needs to be parsed as a |
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Adapts the code to support haskell/cabal#6798 and maintains backward compatibility with previous versions of the Cabal library.