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Initial support for return type notation (RTN) See: https://smallcultfollowing.com/babysteps/blog/2023/02/13/return-type-notation-send-bounds-part-2/ 1. Only supports `T: Trait<method(): Send>` style bounds, not `<T as Trait>::method(): Send`. Checking validity and injecting an implicit binder for all of the late-bound method generics is harder to do for the latter. * I'd add this in a follow-up. 3. ~Doesn't support RTN in general type position, i.e. no `let x: <T as Trait>::method() = ...`~ * I don't think we actually want this. 5. Doesn't add syntax for "eliding" the function args -- i.e. for now, we write `method(): Send` instead of `method(..): Send`. * May be a hazard if we try to add it in the future. I'll probably add it in a follow-up later, with a structured suggestion to change `method()` to `method(..)` once we add it. 7. ~I'm not in love with the feature gate name 😺~ * I renamed it to `return_type_notation` ✔️ Follow-up PRs will probably add support for `where T::method(): Send` bounds. I'm not sure if we ever want to support return-type-notation in arbitrary type positions. I may also make the bounds require `..` in the args list later. r? `@ghost` |
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For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.