haskellPackages.exitcode 0.1.0.6 -> 0.1.0.9 https://repology.org/project/haskell:exitcode/versions
attrpath: haskellPackages.exitcode
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There might already be an open PR for this update:
- Frozen haskellPackages set for 21.05 to ease backporting bug fix releases
  URL "https://api.github.com/repos/NixOS/nixpkgs/issues/138407"