From e3ef2ff05fc8e99f9a187e788713c65486f04d16 Mon Sep 17 00:00:00 2001
From: Nicholas Nethercote <n.nethercote@gmail.com>
Date: Mon, 25 Nov 2024 06:50:55 +1100
Subject: [PATCH] Streamline a `BitSet` creation.

---
 compiler/rustc_mir_transform/src/coroutine.rs | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/compiler/rustc_mir_transform/src/coroutine.rs b/compiler/rustc_mir_transform/src/coroutine.rs
index f262912fab13b..7fbb5d70d6692 100644
--- a/compiler/rustc_mir_transform/src/coroutine.rs
+++ b/compiler/rustc_mir_transform/src/coroutine.rs
@@ -697,8 +697,7 @@ fn locals_live_across_suspend_points<'tcx>(
             let loc = Location { block, statement_index: data.statements.len() };
 
             liveness.seek_to_block_end(block);
-            let mut live_locals: BitSet<_> = BitSet::new_empty(body.local_decls.len());
-            live_locals.union(liveness.get());
+            let mut live_locals = liveness.get().clone();
 
             if !movable {
                 // The `liveness` variable contains the liveness of MIR locals ignoring borrows.