#12107: Strange behavior of Foldable (,) a -------------------------------------+------------------------------------- Reporter: polarke | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Core | Version: 8.0.1 Libraries | Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Other Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- The definion of ''Foldable (,) a'' is as follows. {{{#!hs instance Foldable ((,) a) where foldMap f (_, y) = f y foldr f z (_, y) = f y z }}} I am very confused with this definition. As a consequence, we have {{{#!hs maximum (1,0) == 0 }}} I believe this is not something we want. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12107 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler