Must we specify the field sets being borrowed explicitly? Can’t they be inferred?In the syntax I described, you have to write &mut place {field1, field2} explicitly. But there are many approaches in the literature to inferring this sort of thing, with row polymorphism perhaps being the most directly applicable. I think we could absolutely introduce this sort of inference, and in fact I’d probably make it the default, so that &mut place always introduces a view type, but it is typically inferred to “all fields” in practice. But that is a non-trivial extension to Rust’s inference system, introducing a new kind of inference we don’t do today. For the MVP, I think I would just lean on auto-ref covering by far the most common case, and have explicit syntax for the rest.
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