[plt-scheme] get the list of modules in a namespace

On Jul 30, YC wrote:
> Hi -
> 
> how can I get a list of the modules in a namespace?  I'm trying to
> merge two namespaces, and it seems the easiest way is to use
> `namespace-attach-module`, which requires me to know the list of
> modules that belongs to the source namespace.
> 
> It seems that there is something called namespace-registry that
> holds such information, but there doesn't appear to be a way to
> manipulate it.
> 
> Is there a way to accomplish the goal?

Seems like there is only `namespace-module-registry', which returns a
value that you can't really use for anything (see the docs).  But I
think that to merge two namespaces you'll need to scan the bindings
from each one and create the appropriate bindings in the result, and
`identifier-binding' is what is needed for doing this.

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