From 3888a633b7d594dc77c63854daaa7ef5f754b7d4 Mon Sep 17 00:00:00 2001
From: Jacob Adam <software@jacobadam.net>
Date: Thu, 26 Mar 2026 11:53:17 +0000
Subject: [PATCH] Add a regression test for rustdoc ICEing on negative
 `Deref`/`DerefMut` impls

---
 tests/rustdoc-ui/deref/negative-deref-ice-128801.rs | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 tests/rustdoc-ui/deref/negative-deref-ice-128801.rs

diff --git a/tests/rustdoc-ui/deref/negative-deref-ice-128801.rs b/tests/rustdoc-ui/deref/negative-deref-ice-128801.rs
new file mode 100644
index 000000000000..439727f3d3d3
--- /dev/null
+++ b/tests/rustdoc-ui/deref/negative-deref-ice-128801.rs
@@ -0,0 +1,11 @@
+//@ check-pass
+
+// Regression test for https://github.com/rust-lang/rust/issues/128801
+// Negative `Deref`/`DerefMut` impls should not cause an ICE.
+
+#![feature(negative_impls)]
+
+pub struct Source;
+
+impl !std::ops::Deref for Source {}
+impl !std::ops::DerefMut for Source {}