Sittampalam, Ganesh wrote:
I think it treats them as compatible, using the fact that
Data.Typeable returns the same type reps (which was why I initially
mentioned Data.Typeable in this thread). This is fine for "normal"
modules. There's a bit of description in the "Dynamic Typing" section of
http://www.cse.unsw.edu.au/~dons/hs-plugins/hs-plugins-Z-H-5.html#node_s
ec_9
It's clearly the wrong thing to do for Data.Unique and any anything
else that might use <-; but if there are no such types in the interface
of the plugin, then it won't matter. I can't see how to make it
safe to pass Data.Unique etc across a plugin interface without
severely restricting the possible implementation strategies for
a plugin library and its host.
I think it's bad design for a dynamic loader to load a module more than
once anyway. It's a waste of memory, for a start. We already know that
hs-plugins won't for modules it already loaded itself (apparently it
crashes the RTS), and I suspect it doesn't at all.
--
Ashley Yakeley
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