[Haskell-cafe] Proposal: Shorter Import Syntax

[Sven Panne]

2015-06-06 22:09 GMT+02:00 Anthony Cowley <acowley at seas.upenn.edu>:

> I'll repeat myself:
>

... and so do I:

1) The proposed extension will live behind a pragma
>

That's exactly what I'm asking for: A new {-# LANGUAGE FunkyImports #-}
pragma (name to be decided ;-), which must be mentioned in a cabal file's
"extension:" field (
https://www.haskell.org/cabal/users-guide/developing-packages.html#creating-a-package).
Failing to mention a language extension is just as wrong as declaring wrong
bounds.


> 2) cabal does not take language extensions into account when computing
> a build plan
>

If that's actually the case (can some Cabal devs clarify this?), than it's
a Cabal bug, otherwise the "extension:" field would be meaningless and
build plans would be fragile. Anyway, this has nothing to do per se with
the proposal.


> The only way to give cabal a clue about a used extension is to put a
> lower bound on base, but you specifically rejected that as ridiculous.
>

That would in fact be ridiculous, just as saying "every release with a
prime major version number implies the new language extension.". One could
perfectly implement any base version without implementing the proposal.
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