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Fix performance issue in liveness checking #151376

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Merged
rust-bors merged 1 commit into from
Jan 30, 2026
+5 −5
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Fix performance issue in liveness checking #151376

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10 changes: 5 additions & 5 deletions compiler/rustc_mir_transform/src/liveness.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1086,11 +1086,6 @@ impl<'a, 'tcx> AssignmentResult<'a, 'tcx> {

let Some((name, decl_span)) = self.checked_places.names[index] else { continue };

// By convention, underscore-prefixed bindings are explicitly allowed to be unused.
if name.as_str().starts_with('_') {
continue;
}

let is_maybe_drop_guard = maybe_drop_guard(
tcx,
self.typing_env,
Expand Down Expand Up @@ -1118,6 +1113,11 @@ impl<'a, 'tcx> AssignmentResult<'a, 'tcx> {
continue;
};

// By convention, underscore-prefixed bindings are allowed to be unused explicitly
if name.as_str().starts_with('_') {
break;
}

match kind {
AccessKind::Assign => {
let suggestion = annotate_mut_binding_to_immutable_binding(
Expand Down
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