From 2b201cfb1b200cb2065cf0062f35c95ebd3e2862 Mon Sep 17 00:00:00 2001
From: Martin Nordholts <martin.nordholts@codetale.se>
Date: Tue, 30 Dec 2025 15:46:40 +0100
Subject: [PATCH] experiment: Add simple externally implementable item to std

This gives lots of strange compilation errors. See
https://gist.github.com/Enselic/c643f454515db6f10caa7ab04045ab32
for the full list.
---
 library/std/src/lib.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/library/std/src/lib.rs b/library/std/src/lib.rs
index 0dab29712f4fc..777bf53d69f9c 100644
--- a/library/std/src/lib.rs
+++ b/library/std/src/lib.rs
@@ -283,6 +283,7 @@
 #![feature(doc_masked)]
 #![feature(doc_notable_trait)]
 #![feature(dropck_eyepatch)]
+#![feature(extern_item_impls)]
 #![feature(f16)]
 #![feature(f128)]
 #![feature(ffi_const)]
@@ -760,3 +761,9 @@ mod sealed {
 #[cfg(test)]
 #[allow(dead_code)] // Not used in all configurations.
 pub(crate) mod test_helpers;
+
+#[unstable(feature = "extern_item_impls", issue = "125418")]
+#[eii]
+pub fn changed_with_eii() -> bool {
+    false
+}