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The associated_items(def_id) call allocates internally. Previously, we'd have called it for each pair, so we'd have had O(n^2) many calls. By precomputing the associated items, we avoid repeating so many allocations. The only instance where this precomputation would be a regression is if there's only one inherent impl block for the type, as the inner loop then doesn't run. In that instance, we just early return. Also, use SmallVec to avoid doing an allocation at all if the number is small (the case for most impl blocks out there). |
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| Cargo.toml | ||
| README.md | ||
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.