1 files changed, 22 insertions, 0 deletions
diff --git a/src/test/ui/mut/mut-suggestion.rs b/src/test/ui/mut/mut-suggestion.rs
new file mode 100644
index 000000000..3104b20ac
--- /dev/null
+++ b/src/test/ui/mut/mut-suggestion.rs
@@ -0,0 +1,22 @@
+#[derive(Copy, Clone)]
+struct S;
+
+impl S {
+    fn mutate(&mut self) {
+    }
+}
+
+fn func(arg: S) {
+    //~^ HELP consider changing this to be mutable
+    //~| SUGGESTION mut arg
+    arg.mutate();
+    //~^ ERROR cannot borrow `arg` as mutable, as it is not declared as mutable
+}
+
+fn main() {
+    let local = S;
+    //~^ HELP consider changing this to be mutable
+    //~| SUGGESTION mut local
+    local.mutate();
+    //~^ ERROR cannot borrow `local` as mutable, as it is not declared as mutable
+}