#10963: Beginner-targeted language extension -------------------------------------+------------------------------------- Reporter: kanetw | Owner: Type: feature | Status: new request | Priority: normal | Milestone: Component: Compiler | Version: 7.10.2 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- FMP significantly complicated type signatures such as `length :: Foldable t => t a -> Int`, which makes teaching Haskell more difficult. I propose a language extension `-XBeginner` which instructs GHC(i) to specialize `Foldable` and `Traversable` to `[]` when possible and in case of an ambiguous instance, default those to `[]`. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10963 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler