I see, thanks for the explanation!
On Monday, January 6, 2020 at 10:28:21 PM UTC-5, Matthew Flatt wrote:
>
> The problem is that `namespace-require` has to first resolve the
> `racket` module path, and the module name resolver uses the current
> namespace as determined by `current-namespace` --- which means that the
> resolver loads the `racket` module into the wrong namespace.
>
> I doubt that we can change that behavior without breaking something.
> Probably this will need to be addressed with a documentation
> improvement that discourages providing a namespace directly except in
> limited cases.
>
> At Mon, 6 Jan 2020 19:09:44 -0800 (PST), Yongming Shen wrote:
> > Hi, I have encountered a counterintuitive behavior of namespace-require
> and
> > wonder if it is a bug.
> > Basically, namespace-require behaves differently when the target
> namespace
> > is passed by parameterizing current-namespace, compared to when the
> > optional namespace parameter is used.
> >
> > For example, this works:
> >
> > (define ns (make-base-empty-namespace))
> > (parameterize ([current-namespace ns]) (namespace-require 'racket))
> >
> > But this gives an error about unknown module:
> >
> > (define ns (make-base-empty-namespace))
> > (namespace-require 'racket ns)
> >
> > require: unknown module
> > module name: # > v7.3/collects/racket/main.rkt">
> >
> > Am I doing something wrong in the second case?
> >
> > Thanks,
> > Yongming
> >
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