#13573: Add Foldable1 to base -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: (none) Type: feature request | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #10365 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by Iceland_jack): Examples from [https://hackage.haskell.org/package/algebra-4.3/docs /Numeric-Algebra-Class.html alge][https://hackage.haskell.org/package/algebra-4.3/docs/Numeric- Additive-Class.html bra] package {{{#!hs class Additive r where (+) :: r -> r -> r sumWith1 :: Foldable1 f => (a -> r) -> f a -> r class Multiplicative r where (*) :: r -> r -> r productWith1 :: Foldable1 f => (a -> r) -> f a -> r }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13573#comment:10 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler