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rustc_middle: Optimize DefId comparisons #155608

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rustc_middle: Optimize DefId comparisons #155608

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4 changes: 3 additions & 1 deletion compiler/rustc_middle/src/ty/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -338,7 +338,9 @@ impl TyCtxt<'_> {
}

pub fn is_descendant_of(self, mut descendant: DefId, ancestor: DefId) -> bool {
if descendant.krate != ancestor.krate {
// Def-ids from different crates are always unordered, and def-ids of parent nodes
// are always created before def-ids of child nodes.
if descendant.krate != ancestor.krate || descendant.index < ancestor.index {
return false;
}

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