1 files changed, 29 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/wrong_self_conventions_mut.rs b/src/tools/clippy/tests/ui/wrong_self_conventions_mut.rs
new file mode 100644
index 000000000..5bb2116bd
--- /dev/null
+++ b/src/tools/clippy/tests/ui/wrong_self_conventions_mut.rs
@@ -0,0 +1,29 @@
+#![warn(clippy::wrong_self_convention)]
+#![allow(dead_code)]
+
+fn main() {}
+
+mod issue6758 {
+    pub enum Test<T> {
+        One(T),
+        Many(Vec<T>),
+    }
+
+    impl<T> Test<T> {
+        // If a method starts with `to_` and not ends with `_mut` it should expect `&self`
+        pub fn to_many(&mut self) -> Option<&mut [T]> {
+            match self {
+                Self::Many(data) => Some(data),
+                _ => None,
+            }
+        }
+
+        // If a method starts with `to_` and ends with `_mut` it should expect `&mut self`
+        pub fn to_many_mut(&self) -> Option<&[T]> {
+            match self {
+                Self::Many(data) => Some(data),
+                _ => None,
+            }
+        }
+    }
+}