Upgrading packages/Updating to GHC 7
< Upgrading packages
Jump to navigation
Jump to search
Revision as of 12:41, 29 September 2010 by DonStewart (talk | contribs)
The printable version is no longer supported and may have rendering errors. Please update your browser bookmarks and please use the default browser print function instead.
A list of common problems upgrading packages to GHC 7.
If you maintain packages, this is for you.
-XMonoLocalBinds
If you use -XGADTs or -XTypeFamilies (or -fglasgow-exts, which is deprecated) you get -XMonoLocalBinds, which says that local let/where bindings are not auto-generalised. There's an extensive discussion of the reason for this decision in our paper "Let should not be generalised" and the journal version
* http://haskell.org/haskellwiki/Simonpj/Talk:OutsideIn
base 3 goes away
There is no base 3 now, after being deprecated for several years, so dependencies on base 3 won't compile with GHC 7.