#13353: foldr/nil rule not applied consistently -------------------------------------+------------------------------------- Reporter: nomeata | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj):
I just had a project where it made a difference whether I add `{-# RULES "foldr/nil" forall k n . GHC.Base.foldr k n [] = n #-}` to my file or not, despite this rule already being present in the library.
I have no explanation for that!! -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13353#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler