Remove feature(impl_trait_projections) from async traits. #503
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It's possible
async_fn_in_traitswill get stabilized beforeimpl_trait_projections(see zulip thread).Trying out whether it's feasible to use
async_fn_in_traitsonly. Do not merge yet. Since it makes the code a bit uglier, we should only merge this if indeedasync_fn_in_traitsgets stabilized beforeimpl_trait_projections.EDIT: maybe
impl_trait_projectionsdoes get stabilized before AFIT: rust-lang/rust#115659