#1830: Automatic derivation of Lift -------------------------------------+------------------------------------- Reporter: guest | Owner: | RyanGlScott Type: feature request | Status: new Priority: normal | Milestone: ⊥ Component: Template Haskell | Version: 6.8.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: Phab:D1168 -------------------------------------+------------------------------------- Comment (by RyanGlScott): According to [http://packdeps.haskellers.com/reverse/th-lift packdeps], 32 libraries immediately depend on `th-lift`. Doing a grep of [https://github.com/bitemyapp/hackage-packages hackage-packages] for files that contain both {{{Language.Haskell.TH.Syntax}}} and {{{instance Lift }}} reveals that these additional libraries define their own {{{Lift}}} instances: {{{ persistent-template shakespeare instant-generics yesod-core sqlite-simple-typed generic-deriving Euterpea regular mysql-simple-typed cake3 lighttpd-conf postgresql-simple-typed type pcre-heavy myTestlll multirec-alt-deriver yesod-routes type-level-tf debian vimus named-records module-management Contract grammar-combinators groundhog-th api-tools Webrexp Webrexp type-level web-routes-quasi monad-logger QuasiText ta logging-facade }}} This obviously isn't scientifically rigorous, as there is a chance that the {{{instance Lift}}} could be using some other {{{Lift}}}, or that the {{{Lift}}} instances in those packages wouldn't be derivable in the first place. But this at least gives an approximation of how much impact {{{deriving Lift}}} might have. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/1830#comment:15 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler