#9674: Foldable doesn't have any laws -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: ekmett Type: bug | Status: new Priority: normal | Milestone: Component: Core | Version: 7.8.3 Libraries | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: | Related Tickets: Documentation bug | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by ekmett): The laws should be given in terms of `foldMap` and various monoids from `Data.Monoid` rather than `foldr` or `toList`, otherwise the laws will be inaccurate where infinite snoc-lists and the like are involved. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9674#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler