From 1ad705f20f3728e669aa90a6782be8eb8fadebfa Mon Sep 17 00:00:00 2001
From: Jane Losare-Lusby <jlusby42@gmail.com>
Date: Fri, 21 Nov 2025 14:08:33 -0800
Subject: [PATCH] Add test for derive helper compat collisions

---
 .../ui/proc-macro/auxiliary/extra-empty-derive.rs |  7 +++++++
 .../ui/proc-macro/helper-attr-compat-collision.rs | 15 +++++++++++++++
 2 files changed, 22 insertions(+)
 create mode 100644 tests/ui/proc-macro/auxiliary/extra-empty-derive.rs
 create mode 100644 tests/ui/proc-macro/helper-attr-compat-collision.rs

diff --git a/tests/ui/proc-macro/auxiliary/extra-empty-derive.rs b/tests/ui/proc-macro/auxiliary/extra-empty-derive.rs
new file mode 100644
index 0000000000000..9a89e04364d75
--- /dev/null
+++ b/tests/ui/proc-macro/auxiliary/extra-empty-derive.rs
@@ -0,0 +1,7 @@
+extern crate proc_macro;
+use proc_macro::{TokenStream, TokenTree};
+
+#[proc_macro_derive(Empty2, attributes(empty_helper))]
+pub fn empty_derive2(_: TokenStream) -> TokenStream {
+    TokenStream::new()
+}
diff --git a/tests/ui/proc-macro/helper-attr-compat-collision.rs b/tests/ui/proc-macro/helper-attr-compat-collision.rs
new file mode 100644
index 0000000000000..2952afb126be1
--- /dev/null
+++ b/tests/ui/proc-macro/helper-attr-compat-collision.rs
@@ -0,0 +1,15 @@
+//@ proc-macro: test-macros.rs
+//@ proc-macro: extra-empty-derive.rs
+//@ build-pass
+
+#[macro_use(Empty)]
+extern crate test_macros;
+#[macro_use(Empty2)]
+extern crate extra_empty_derive;
+
+#[derive(Empty)]
+#[empty_helper]
+#[derive(Empty2)]
+struct S;
+
+fn main() {}