Polonius lets Rust skip an allocation the borrow checker used to demand
A nightly-only borrow-checker upgrade accepts the natural borrowed-key lookup-or-insert pattern, avoiding owned-key construction on cache hits.
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Geometry, growing things, wordplay, code, and other patterns worth a closer look.
The archive
A nightly-only borrow-checker upgrade accepts the natural borrowed-key lookup-or-insert pattern, avoiding owned-key construction on cache hits.
Continue reading →