From 86881226b0e51c204f07385b7b57743c23e34d44 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Th=C3=A9ophane=20Hufschmitt?=
 <7226587+thufschmitt@users.noreply.github.com>
Date: Tue, 31 Oct 2023 16:19:05 +0100
Subject: Merge pull request #8817 from iFreilicht/flake-update-lock-overhaul

Overhaul `nix flake update` and `nix flake lock` UX

(cherry picked from commit 12a0ae73dbb37becefa5a442eb4532ff0de9ce65)
Change-Id: Iff3b4f4235ebb1948ec612036b39ab29e4ca22b2
---
 src/libutil/args.cc | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

(limited to 'src/libutil/args.cc')

diff --git a/src/libutil/args.cc b/src/libutil/args.cc
index 77069c7b9..3e39b4d7c 100644
--- a/src/libutil/args.cc
+++ b/src/libutil/args.cc
@@ -255,7 +255,18 @@ bool Args::processArgs(const Strings & args, bool finish)
         }
         if (!anyCompleted)
             exp.handler.fun(ss);
-        expectedArgs.pop_front();
+
+        /* Move the list element to the processedArgs. This is almost the same as
+           `processedArgs.push_back(expectedArgs.front()); expectedArgs.pop_front()`,
+           except that it will only adjust the next and prev pointers of the list
+           elements, meaning the actual contents don't move in memory. This is
+           critical to prevent invalidating internal pointers! */
+        processedArgs.splice(
+            processedArgs.end(),
+            expectedArgs,
+            expectedArgs.begin(),
+            ++expectedArgs.begin());
+
         res = true;
     }
 
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