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Fortunately this particular problem should go away soon. Async-fn-in-traits is due to be stabilized in the next few months [1], which means that the use of #[async_trait] will no longer be necessary, which means the compiler will correctly surface a warning for unbounded recursion.

[1] https://blog.rust-lang.org/inside-rust/2023/05/03/stabilizin...

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Check this out: https://github.com/rust-lang/rust/issues/111177

The lack of warning does not seem to be related to #[async_trait] -- it's reproducible on a bare function, as shown in the post and in sibling comment's 2nd link.

The lack of warning is from returning `Box<dyn Future>`, which `#[async_trait]` emits. ( https://news.ycombinator.com/item?id=35834091 )

With async-fn-in-trait that flooow linked to (and more generally type-alias-impl-trait) there won't be a motication to use `Box<dyn Future>` in the first place.

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