Reading through some code of mine, seeing a trait’s method returning Box<Iterator<…>>… Please @rustlang, we must stabilize conservative_impl_trait and all related extensions!pic.twitter.com/KfGi5zjZbh
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That’s a very good news then!
@yoeight conservative_impl_trait is a bit different though. Boxing a trait is existential quantification, but conservative_impl_trait enables you to statically select the type and remove any indirection, since it’s the function itself that chooses the returned type. 1/2
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