From 4d24b93cbbcad9c4974dab05a0f5a524fdd35a04 Mon Sep 17 00:00:00 2001
From: Craig Tiller <ctiller@google.com>
Date: Tue, 15 Aug 2023 21:43:15 -0700
Subject: [PATCH] Revert "Revert "[absl] Swisstables dont allow calling
 begin/extract after move"" (#34074)

Reverts grpc/grpc#34072

This code is not used in anything related to production at this point
and so could not have caused any breakage.
---
 src/core/lib/promise/wait_set.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/core/lib/promise/wait_set.h b/src/core/lib/promise/wait_set.h
index f6ab341cf5b..2f978e5750a 100644
--- a/src/core/lib/promise/wait_set.h
+++ b/src/core/lib/promise/wait_set.h
@@ -64,7 +64,9 @@ class WaitSet final {
   };
 
   GRPC_MUST_USE_RESULT WakeupSet TakeWakeupSet() {
-    return WakeupSet(std::move(pending_));
+    auto ret = WakeupSet(std::move(pending_));
+    pending_.clear();  // reinitialize after move.
+    return ret;
   }
 
  private: