#9527: Add Generic instances for Language.Haskell.TH -------------------------------------+------------------------------------- Reporter: nh2 | Owner: goldfire Type: feature | Status: new request | Milestone: 7.10.1 Priority: normal | Version: 7.8.3 Component: Core | Keywords: Libraries | Architecture: Unknown/Multiple Resolution: | Difficulty: Moderate (less Operating System: | than a day) Unknown/Multiple | Blocked By: 9526 Type of failure: | Related Tickets: None/Unknown | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by goldfire): An IRC discussion suggests not adding `Binary` instances: hvr 1:32 goldfire: well, we only recently dropped the containers dep in template-haskell to not force users wanting to use TH to a specific containers verison hvr 1:32 goldfire: adding dep on 'binary' would be rather undesirable in that respect goldfire 1:32 hvr: That makes sense. 1:33 hvr: Does this get mitigated at all by the Backpack work? hvr 1:33 goldfire: no idea tbh goldfire 1:33 Because my (very loose) understanding is that multiple versions of the same package can now coexist peacefully. 1:34 So, a TH client that doesn't use the Binary instances would be welcome to use a different version of the binary package. 1:34 But, a TH client that wanted to use the TH Binary instances would be tied to the specific version of binary that TH ships with, lest they get type errors. 1:35 ezyang: Care to comment on my and hvr's discussion just now? ezyang 1:46 goldfire, hvr: As with everything, this comes with the caveat that Cabal doesn't know how to handle this, but yes, in principle this is possible with the new change rwbarton 1:47 sounds like it would make sense to wait until 7.12 to add those instances goldfire 1:47 rwbarton: Yes, that's the conclusion I'm coming to. luite: Care to counter? rwbarton 1:48 since the out-of-process TH most likely won't land in 7.10 anyways right? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9527#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler