Allow Proxy to implement Send
#39
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Proxy contained a PhantomData<*const P>, which prevented it from implementing Send. PhantomData<fn() -> P> avoids this problem.
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Proxy uses
PhantomData<*const P>, which prevents it from implementingSend. I see that this was done intentionally forProxyin e863862 (while all the other types usefn() -> P), but I don't understand why.Is there a reason
Proxycannot safely implementSend, or some other reason*const Pis required?