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Haskell GHC 8.4 and Stackage LTS 12

The Fedora Haskell packages have been updated to ghc-8.4.4 and Stackage LTS 12 versions, with focus on performance, stability, consolidation, and numerous cleanups throughout the compiler:

  • Further refinement of TypeInType, including significant improvements in error messages.

  • Improvements in code generation resulting in noticable performance improvements in some types of programs.

  • Core library improvements, including phase 2 of the Semigroup/Monoid proposal.

  • Many improvements to instance deriving.

  • The resolution of nearly 300 other tickets for the 8.4.1 major release, and further bugfixes in the subsequent stable minor version releases.

For details, see upstream release announcements: