#2439: Missed optimisation with dictionaries and loops ---------------------------------+------------------------------------------ Reporter: rl | Owner: simonpj Type: bug | Status: new Priority: lowest | Milestone: 7.6.2 Component: Compiler | Version: 6.9 Keywords: | Os: Unknown/Multiple Architecture: Unknown/Multiple | Failure: Runtime performance bug Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ Changes (by carter): * cc: carter.schonwald@… (added) Comment: @simon changing the single method type class encoding would break edwardk's reflection library http://hackage.haskell.org/package/reflection (which exploits that newtype encoding for single method type classes) Is there a natural example where forcing that single method to whnf (if you mean that form of strictness) would be bad? -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/2439#comment:18 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler