From 793e88ad168a7ca63e9cd95faf8e7833fb5c341b Mon Sep 17 00:00:00 2001
From: LeSeulArtichaut <leseulartichaut@gmail.com>
Date: Sat, 6 Feb 2021 16:40:30 +0100
Subject: [PATCH] Add regression test for #81289

---
 src/test/rustdoc/mut-params.rs | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 src/test/rustdoc/mut-params.rs

diff --git a/src/test/rustdoc/mut-params.rs b/src/test/rustdoc/mut-params.rs
new file mode 100644
index 00000000000..1ef7e304fa2
--- /dev/null
+++ b/src/test/rustdoc/mut-params.rs
@@ -0,0 +1,18 @@
+// Rustdoc shouldn't display `mut` in function arguments, which are
+// implementation details. Regression test for #81289.
+
+#![crate_name = "foo"]
+
+pub struct Foo;
+
+// @count foo/struct.Foo.html '//*[@class="impl-items"]//*[@class="method"]' 2
+// @!has - '//*[@class="impl-items"]//*[@class="method"]' 'mut'
+impl Foo {
+    pub fn foo(mut self) {}
+
+    pub fn bar(mut bar: ()) {}
+}
+
+// @count foo/fn.baz.html '//*[@class="rust fn"]' 1
+// @!has - '//*[@class="rust fn"]' 'mut'
+pub fn baz(mut foo: Foo) {}