From 5da11070e9851d15b7c6200006ae525a22ef8c18 Mon Sep 17 00:00:00 2001
From: EJ <evyatar.shafran@gmail.com>
Date: Wed, 22 Jul 2026 20:31:11 +0200
Subject: [PATCH] Test that Allocator interface avoids IB for max size
 allocations (#35437)

Closes [#6076](https://github.com/ziglang/zig/issues/6076)

Tracking issue: #31661

Reviewed-on: https://codeberg.org/ziglang/zig/pulls/35437
---
 lib/std/mem/Allocator.zig | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/std/mem/Allocator.zig b/lib/std/mem/Allocator.zig
index 80341ecc2fa30523ef26bf7f1f68087fea18b925..486c69966e0e3d9bccf1b99e92d404cc36363283 100644
--- a/lib/std/mem/Allocator.zig
+++ b/lib/std/mem/Allocator.zig
@@ -587,4 +587,7 @@ fn unreachableFree(
 test failing {
     const f: Allocator = .failing;
     try std.testing.expectError(error.OutOfMemory, f.alloc(u8, 123));
+    // Expect very large allocations to fail at the implementation level and not in the interface
+    try std.testing.expectError(error.OutOfMemory, f.alloc(u8, std.math.maxInt(usize)));
+    try std.testing.expectError(error.OutOfMemory, f.allocSentinel(u8, std.math.maxInt(usize) - 1, 0));
 }
-- 
2.54.0