On 29/05/2013, at 9:02 AM, Ben Franksen wrote:
Bryan O'Sullivan wrote:
I have made a wiki page describing a new proposal, NoImplicitPreludeImport, which I intend to propose for Haskell 2014:
http://hackage.haskell.org/trac/haskell-prime/wiki/NoImplicitPreludeImport
What do you think?
This is a truly terrible idea.
It purports to be a step towards fixing the backwards compatibility problem, but of course it breaks every module ever written along the way, and it means that packages that try to be compatible across multiple versions of GHC will need mandatory CPP #ifdefs for years to come.
I think it need not necessarily come to that. If we do this right, then adding a line
extensions: ImplicitPrelude
You could handle this more generally by implementing a compiler flag that causes modules to be imported. We've already got "-package P" for exposing packages, we could add "-module M" for exposing modules. When compiling with a Haskell2014 compiler just add the "-module Prelude" flag to your Makefile/.cabal file. Ben.