[Haskell-cafe] Packages and modules
robdockins at fastmail.fm
Sun Jun 25 18:32:44 EDT 2006
On Sunday 25 June 2006 05:16 am, Brian Hulley wrote:
> Hi -
> At the moment there is a problem in that two packages P and Q could contain
> the same hierarchical module eg Data.Foo, and the only way for user code to
> ensure the "right" Data.Foo is used is to ensure that packages P and Q are
> searched in the right order.
> However suppose P and Q also contain another module with the same name, eg
> And suppose a user module wants to use Data.Foo from P but Data.Bar from
> I'm wondering: would it not be easier to just make it that the package name
> is prepended to the hierarchical module name, so the modules would instead
> be called by the names P.Data.Foo and Q.Data.Bar?
[snip discussion of this idea]
The idea of improving the module system has been discussed a number of times
before. Here is a thread started by a suggestion from the simons which
generated a fair bit of discussion:
I'm not sure whatever became of this idea; discussion seemed to sort of reach
a consensus, and then nothing happened.
The module "grafting" mechanism always seemed kind of nice to me. I think
some of the problems discussed in this thread could be by using cabal,
especially to specify the graftings expected for compilation. It seems like
grafting can give a plausible story for dealing with dynamicly loaded code,
which is a nice bonus.
Talk softly and drive a Sherman tank.
Laugh hard, it's a long way to the bank.
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