Open HWoidt opened 8 years ago
Comment by HWoidt Saturday Jan 23, 2016 at 07:11 GMT
There has been an update on the GHC ticket. The upcoming version of GHC will support automatic derivation of the Lift instance using "... deriving Lift" through the -XDeriveLift extension.
https://ghc.haskell.org/trac/ghc/ticket/1830 https://phabricator.haskell.org/D1168 https://phabricator.haskell.org/D1269
Issue by HWoidt Saturday Jul 11, 2015 at 13:04 GMT Originally opened as https://gits-15.sys.kth.se/ingo/forsyde-deep/issues/16
Reported by alfonso....@gmail.com, Jun 23, 2008
As we know, all the types handled by ForSyDe are required to be instances of Data.
Creating a "Data a => Lift a" (undecidable) instance would make all instances of Data (and implicilty all ForSyDe-supported types) also instances of Lift, sparing us from needing to use $(deriveLift WhateverDataType).
I created ticket [1] in GHC's track asking for this feature a while ago, and they accepted to include it in GHC 6.10, but that won't happen in a while.
[1] http://hackage.haskell.org/trac/ghc/ticket/1830