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Notes on partial borrows - language design - Rust Internals
https://internals.rust-lang.org/t/notes-on-partial-borrows/20020
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Rust Internals · Notes on partial borrowsOne of the borrow checker's major limitations is that it's not possible to create a reference that borrows from a subset of a type (such that borrows of non-overlapping subsets will not conflict). A langauge-level solution to this problem has long been desired. For example, given a struct Foo { x: i32, y: String, z: u32 }, here's a (non-exhaustive) list of things people might want to express: A reference to a Foo takes a shared borrow of fields x and y only, both for lifetime 'a A reference t...