#8155: Defaulting bug or unfortunate error message with closed type families -------------------------------------+------------------------------------ Reporter: nh2 | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.6.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------ Changes (by simonpj): * status: closed => new * resolution: invalid => Comment: Thank you for identifying this problem. Once I understood it, the fix was easy. New error message is much more sensible {{{ T8155.hs:26:14: Could not deduce (Integral (BoundsOf (a -> a))) arising from a use of ‛buildV’ from the context (Num a) bound by the instance declaration at T8155.hs:25:10-32 In the expression: buildV In an equation for ‛build'’: build' = buildV In the instance declaration for ‛Build (a -> a)’ }}} Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8155#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler