#9515: Deprecate -XExplicitForAll -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: Type: feature | Status: new request | Milestone: Priority: normal | Version: 7.8.3 Component: Compiler | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: | Related Tickets: None/Unknown | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by dfeuer): I've gone over practically the entire GHC source tree (I ran out of time before I could look at the last few validation tests files). === Good News === Very few files explicitly use `ExplicitForAll`. Of all the files that use `ExplicitForAll` or anything that implies it, only one, a file in the `fibon` benchmark suite, would need minor changes to work with `ScopedTypeVariables`. === Bad News === Lots and lots of files use extensions that imply `ExplicitForAll` and don't use `ScopedTypeVariables`. I don't personally see an obvious way to warn when something ''implying'' `ExplicitForAll` is used without `ScopedTypeVariables`, although someone else may be able to figure something out. === Question === Should we just bite the bullet and just make everything that currently implies `ExplicitForAll` imply `ScopedTypeVariables` instead? It seems, contrary to my earlier fears, that this is likely to break very little real code. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9515#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler