> On Dec 20, 2016, at 8:54 AM, Jens Alfke via swift-users 
> <swift-users@swift.org> wrote:
> 
> Also, AFAIK there is no mechanism in Swift (yet) to load or unload a module 
> at runtime, so a module load occurs when the program starts up, and an unload 
> occurs when the program exits. 

dlopen works fine, though the only supported ways of getting a callable symbol 
out of the loaded image are currently to use a C entry point or look up a type 
defined in the module by name. Unloading Swift modules will likely never be 
supported, since this would impose a ton of complexity and performance cost on 
the runtime for little benefit. (Apple's ObjC runtime does not support 
unloading dylibs after classes inside them have been reified either.)

-Joe
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