#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):
Also, in all cases, map id remains, which should not be the case.
I think we are missing {{{ {-# RULES "mapFB/id" forall c. mapFB c (\x->x) = c #-} }}} Want to try adding that? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13353#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler