1 files changed, 32 insertions, 0 deletions
diff --git a/tests/ui/illegal-sized-bound/mutability-mismatch.rs b/tests/ui/illegal-sized-bound/mutability-mismatch.rs
new file mode 100644
index 000000000..01bb3537c
--- /dev/null
+++ b/tests/ui/illegal-sized-bound/mutability-mismatch.rs
@@ -0,0 +1,32 @@
+struct MutType;
+
+pub trait MutTrait {
+    fn function(&mut self)
+    where
+        Self: Sized;
+}
+
+impl MutTrait for MutType {
+    fn function(&mut self) {}
+}
+
+struct Type;
+
+pub trait Trait {
+    fn function(&self)
+    where
+        Self: Sized;
+}
+
+impl Trait for Type {
+    fn function(&self) {}
+}
+
+fn main() {
+    (&MutType as &dyn MutTrait).function();
+    //~^ ERROR the `function` method cannot be invoked on `&dyn MutTrait`
+    //~| HELP you need `&mut dyn MutTrait` instead of `&dyn MutTrait`
+    (&mut Type as &mut dyn Trait).function();
+    //~^ ERROR the `function` method cannot be invoked on `&mut dyn Trait`
+    //~| HELP you need `&dyn Trait` instead of `&mut dyn Trait`
+}