From 5bb6e3bfafbcd101962b39ce579ee56d670cd83a Mon Sep 17 00:00:00 2001
From: Yorick van Pelt <yorick@yorickvanpelt.nl>
Date: Thu, 2 Mar 2023 17:24:58 +0100
Subject: [PATCH] NixRepl::mainLoop: restore old curRepl on function exit

This fixes completion callbacks after entering and leaving a nested
debugger.
---
 src/libcmd/repl.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/libcmd/repl.cc b/src/libcmd/repl.cc
index e3afb1531..29c838ec0 100644
--- a/src/libcmd/repl.cc
+++ b/src/libcmd/repl.cc
@@ -252,7 +252,9 @@ void NixRepl::mainLoop()
     el_hist_size = 1000;
 #endif
     read_history(historyFile.c_str());
+    auto oldRepl = curRepl;
     curRepl = this;
+    Finally restoreRepl([&] { curRepl = oldRepl; });
 #ifndef READLINE
     rl_set_complete_func(completionCallback);
     rl_set_list_possib_func(listPossibleCallback);