[GHC] #9791: Ghc panics on tiny example, naive try to overload compose
#9791: Ghc panics on tiny example, naive try to overload compose -------------------------------------+------------------------------------- Reporter: camarao | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.4.1 Keywords: Overloading | Operating System: Linux Architecture: x86 | Type of failure: Compile- Difficulty: Easy (less than 1 | time crash hour) | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- {-# LANGUAGE MultiParamTypeClasses #-} class Compose a b c e f where (<.>)::(b -> c)->(a -> e)->(a -> f) instance Compose a b c b c where (<.>) = (.) instance Monad m -> Compose a b c (m b) (m c) where (<.>) f g a = g a >>= (return . f) -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9791 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#9791: Ghc panics on tiny example, naive try to overload compose -------------------------------------+------------------------------------- Reporter: camarao | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 7.4.1 Resolution: duplicate | Keywords: Overloading Operating System: Linux | Architecture: x86 Type of failure: Compile- | Difficulty: Easy (less than 1 time crash | hour) Test Case: | Blocked By: Blocking: | Related Tickets: #5951 Differential Revisions: | -------------------------------------+------------------------------------- Changes (by thomie): * status: new => closed * resolution: => duplicate * related: => #5951 Comment: Thank you for the report. This has been fixed, try upgrading to GHC 7.6 or 7.8. {{{ $ ghc-7.6.3 test.hs [1 of 1] Compiling Main ( test.hs, test.o ) test.hs:9:10: Malformed instance: Monad m -> Compose a b c (m b) (m c) }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9791#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
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