module namespaces with "Prelude"

Hal Daume III hdaume@ISI.EDU
Mon, 22 Apr 2002 19:21:00 -0700 (PDT)

Ah, so the problem was that even though I had the superdir of NLP in my
path, I was actually loading the modules in ghci from the NLP
directory.  Still, I find this behavior odd, since even if I were in the
NLP directory I could not import "NLP.Foo" simply as "Foo", I don't see
why I should be allowed to (try to) import "NLP.Prelude" simply as
"Prelude", thus messing stuff up...

Hal Daume III

 "Computer science is no more about computers    |
  than astronomy is about telescopes." -Dijkstra |

On 23 Apr 2002, Alastair Reid wrote:

> >>>>> "#Hal" == Hal Daume <hdaume@ISI.EDU> writes:
> > I'm developing my package "NLP" for supporting common NLP functions
> > and have a set of functions/datatypes that are common to almost all
> > of my modules and I wanted to separate them off into an
> > "NLP.Prelude" file, but this seems not to work.  One of my modules
> > imports Prelude (the Haskell one) directly so I can hide a few
> > definitions, but then it looks at NLP/Prelude.lhs and complains that
> > the name of that module "NLP.Prelude" doesn't match "Prelude".
> > SHould I simply name my module "NLP.NLPPrelude" or something (which
> > is ugly, imo) or what?
> The only change that hierarchial module namespaces make is that the
> dots become a legal part of the name and that compilers have a
> sensible way of mapping them onto filenames such as replacing dots by
> slashes.  So, under the new scheme, these names are different and
> unrelated
>    Prelude   NLP.Prelude   User.Hal.Daume.NLP.Prelude
> in the same way that these names were different and unrelated in the
> old scheme.
>    Prelude   NLP_Prelude   User_Hal_Daume_NLP_Prelude
> If you are seeing something other than that, the problem is with your
> compiler or the way you are using command line arguments to your
> compiler (e.g., Hugs' import chasing mechanism has some interesting
> interactions with hierarchial namespaces) and you should say which one
> you're using and how you're using it.
> --
> Alastair Reid