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Fill in prose to describe the
async_fn_in_trait
lint
We're stabilizing `async fn` in trait (AFIT), but we have some reservations about how people might use this in the definitions of publicly-visible traits, so we're going to lint about that. This is a bit of an odd lint for `rustc`. We normally don't lint just to have people confirm that they understand how Rust works. But in this one exceptional case, this seems like the right thing to do as compared to the other plausible alternatives. In this commit, we describe the nature of this odd lint.
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