From 294db62d926ef82f2beb86e7e5ddf8d69092864a Mon Sep 17 00:00:00 2001
From: Travis Staloch <1562827+travisstaloch@users.noreply.github.com>
Date: Mon, 14 Jul 2025 16:35:23 -0700
Subject: [PATCH] memory safety fix for Io.Writer.Allocating.toOwnedSlice*()

don't forget to save the list.  this allows a
`testing.checkAllAllocationFailures()` test to pass in one of my
projects which newly failed since #24329 was merged.
---
 lib/std/Io/Writer.zig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/std/Io/Writer.zig b/lib/std/Io/Writer.zig
index d931248c4d..e02e7e9440 100644
--- a/lib/std/Io/Writer.zig
+++ b/lib/std/Io/Writer.zig
@@ -2446,12 +2446,14 @@ pub const Allocating = struct {
 
     pub fn toOwnedSlice(a: *Allocating) error{OutOfMemory}![]u8 {
         var list = a.toArrayList();
+        defer a.setArrayList(list);
         return list.toOwnedSlice(a.allocator);
     }
 
     pub fn toOwnedSliceSentinel(a: *Allocating, comptime sentinel: u8) error{OutOfMemory}![:sentinel]u8 {
         const gpa = a.allocator;
         var list = toArrayList(a);
+        defer a.setArrayList(list);
         return list.toOwnedSliceSentinel(gpa, sentinel);
     }