Tweak nearest_common_ancestor().#50649
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- Remove the "no nearest common ancestor found" case, because it's never hit in practise. (This means `closure_is_enclosed_by` can also be removed.) - Add a comment about why `SmallVec` is used for the "seen" structures. - Use `&Scope` instead of `Scope` to avoid some `map()` calls. - Use `any(p)` instead of `position(p).is_some()`.
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| let mut mb = Some(&scope_b); | ||
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| // A HashSet<Scope> is a more obvious choice for these, but SmallVec is | ||
| // faster because the set size is normally small so linear search is |
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Did you verify this? It sounds like it should be true but I've run into some surprises because FxHashSet is so fast.
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I did verify it. The difference was small but noticeable.
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@bors r+ 🍑 |
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📌 Commit a91f6f7 has been approved by |
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@bors rollup |
Mark-Simulacrum
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…cestor, r=nikomatsakis Tweak `nearest_common_ancestor()`. - Remove the "no nearest common ancestor found" case, because it's never hit in practise. (This means `closure_is_enclosed_by` can also be removed.) - Add a comment about why `SmallVec` is used for the "seen" structures. - Use `&Scope` instead of `Scope` to avoid some `map()` calls. - Use `any(p)` instead of `position(p).is_some()`. r? @nikomatsakis
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Rollup of 10 pull requests Successful merges: - #50387 (Remove leftover tab in libtest outputs) - #50553 (Add Option::xor method) - #50610 (Improve format string errors) - #50649 (Tweak `nearest_common_ancestor()`.) - #50790 (Fix grammar documentation wrt Unicode identifiers) - #50791 (Fix null exclusions in grammar docs) - #50806 (Add `bless` x.py subcommand for easy ui test replacement) - #50818 (Speed up `opt_normalize_projection_type`) - #50837 (Revert #49767) - #50839 (Make sure people know the book is free oline) Failed merges:
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Remove `ScopeTree::closure_tree` Seems to be dead code since rust-lang#50649.
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Remove `ScopeTree::closure_tree` Seems to be dead code since rust-lang#50649.
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Remove the "no nearest common ancestor found" case, because it's never
hit in practise. (This means
closure_is_enclosed_bycan also beremoved.)
Add a comment about why
SmallVecis used for the "seen" structures.Use
&Scopeinstead ofScopeto avoid somemap()calls.Use
any(p)instead ofposition(p).is_some().r? @nikomatsakis