3 release policy

A "3 release policy" has been recently mentioned several times, whereby it should always be possible to write code that compiles with the last three releases of GHC, without generating any -Wall warnings. The no warning requirement seems excessively harsh. Will early warnings of impending breakage really cause so much trouble that accepted proposals have to be dragged out over several years to avoid them? If so, would a flag to suppress the warnings suffice? I should note that GHC has traditionally had no qualms about introducing new warnings, on by default. -- View this message in context: http://haskell.1045720.n5.nabble.com/3-release-policy-tp5820363.html Sent from the Haskell - Libraries mailing list archive at Nabble.com.