From 16a0241e3614b563aaa470607c33538947b92e32 Mon Sep 17 00:00:00 2001
From: CPunisher <1343316114@qq.com>
Date: Sat, 28 Jun 2025 23:12:35 +0800
Subject: [PATCH 1/3] Fix

---
 src/items.rs | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/items.rs b/src/items.rs
index 0e814644304..f9617acb53a 100644
--- a/src/items.rs
+++ b/src/items.rs
@@ -2342,7 +2342,14 @@ impl Rewrite for ast::Param {
 
             Ok(result)
         } else {
-            self.ty.rewrite_result(context, shape)
+            combine_strs_with_missing_comments(
+                context,
+                &param_attrs_result,
+                &self.ty.rewrite_result(context, shape)?,
+                span,
+                shape,
+                !has_multiple_attr_lines && !has_doc_comments,
+            )
         }
     }
 }

From 678a5e44f360dcd0f7a0298846cffc1bef7d2559 Mon Sep 17 00:00:00 2001
From: CPunisher <1343316114@qq.com>
Date: Sat, 28 Jun 2025 23:12:43 +0800
Subject: [PATCH 2/3] Add variadic test

---
 tests/source/issue-6561/variadic.rs | 5 +++++
 tests/target/issue-6561/variadic.rs | 5 +++++
 2 files changed, 10 insertions(+)
 create mode 100644 tests/source/issue-6561/variadic.rs
 create mode 100644 tests/target/issue-6561/variadic.rs

diff --git a/tests/source/issue-6561/variadic.rs b/tests/source/issue-6561/variadic.rs
new file mode 100644
index 00000000000..6108d584d30
--- /dev/null
+++ b/tests/source/issue-6561/variadic.rs
@@ -0,0 +1,5 @@
+#[allow()]
+unsafe extern "C" {
+    #[allow()]
+    pub fn foo(#[allow()] arg: *mut u8, #[allow()]...);
+}
\ No newline at end of file
diff --git a/tests/target/issue-6561/variadic.rs b/tests/target/issue-6561/variadic.rs
new file mode 100644
index 00000000000..bf5274f31e1
--- /dev/null
+++ b/tests/target/issue-6561/variadic.rs
@@ -0,0 +1,5 @@
+#[allow()]
+unsafe extern "C" {
+    #[allow()]
+    pub fn foo(#[allow()] arg: *mut u8, #[allow()] ...);
+}

From 679c971581966b62c4d08d15363d9623b8f111f4 Mon Sep 17 00:00:00 2001
From: CPunisher <1343316114@qq.com>
Date: Sat, 28 Jun 2025 23:17:40 +0800
Subject: [PATCH 3/3] Add trait fn tests

---
 tests/source/issue-6561/trait-fn.rs | 6 ++++++
 tests/target/issue-6561/trait-fn.rs | 6 ++++++
 2 files changed, 12 insertions(+)
 create mode 100644 tests/source/issue-6561/trait-fn.rs
 create mode 100644 tests/target/issue-6561/trait-fn.rs

diff --git a/tests/source/issue-6561/trait-fn.rs b/tests/source/issue-6561/trait-fn.rs
new file mode 100644
index 00000000000..f88c69dadda
--- /dev/null
+++ b/tests/source/issue-6561/trait-fn.rs
@@ -0,0 +1,6 @@
+// rustfmt-edition: 2015
+
+trait A {
+    fn f1(#[allow()] u32);
+    fn f2(#[allow()] u32, #[allow()] u32);
+}
\ No newline at end of file
diff --git a/tests/target/issue-6561/trait-fn.rs b/tests/target/issue-6561/trait-fn.rs
new file mode 100644
index 00000000000..a30396be561
--- /dev/null
+++ b/tests/target/issue-6561/trait-fn.rs
@@ -0,0 +1,6 @@
+// rustfmt-edition: 2015
+
+trait A {
+    fn f1(#[allow()] u32);
+    fn f2(#[allow()] u32, #[allow()] u32);
+}