Proposal: NoImplicitPreludeImport

Ben Lippmeier benl at
Wed May 29 02:41:30 CEST 2013

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:
>>> 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.


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