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CHANGELOG.md

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Release notes for agda2hs v1.3

Changes

Changes to agda2hs:

  • Increased Agda base version to 2.7
  • Increased bounds to support GHC 9.8.4 and GHC 9.10.2
  • Re-implemented the canonicity check for instances to be simpler but more robust
  • Added {-# COMPILE AGDA2HS ... inline #-} pragma for marking definitions to be inlined during compilation to Haskell
  • Added {-# COMPILE AGDA2HS ... tuple #-} pragma for compiling record types in Agda to a tuple type in Haskell
  • Non-erased implicit arguments and instance arguments are now compiled to regular arguments in Haskell
  • Non-erased module parameters are now compiled to regular arguments in Haskell
  • Rank-N Haskell types are now supported
  • Added agda2hs locate command printing the path to the agda2hs prelude .agda-lib file

Additions to the agda2hs Prelude:

  • New module Haskell.Extra.Dec for working with decidability proofs (compiled to Bool)
  • New module Haskell.Extra.Refinement for working with refinement types (compiled to the base type)
  • New module Haskell.Extra.Erase for working with erased types (compiled to ())
  • New module Haskell.Extra.Sigma for working with dependent pair types (compiled to tuples)
  • New module Haskell.Extra.Loop providing a safe loop function (using an erased fuel argument)
  • New module Haskell.Extra.Delay providing a Delay monad for non-termination (compiled to pure functions in Haskell)
  • New function the in Haskell.Prim for generating Haskell type annotations
  • Added properties to Haskell.Law.Equality: subst, subst0
  • Added properties to Haskell.Law.Bool: ifFlip, ifTrueEqThen, ifFalseEqThen
  • Added properties to Haskell.Law.List: map-concatMap, map-<*>-recomp, concatMap-++-distr
  • Added proofs that many of the instances defined in the prelude are lawful

See https://github.com/agda/agda2hs/issues?q=milestone%3A1.3+is%3Apr for the full list of changes.

Fixed issues

See https://github.com/agda/agda2hs/issues?q=milestone%3A1.3+is%3Aissue for the full list of fixed issues.