1 files changed, 16 insertions, 0 deletions
diff --git a/tests/ui/nll/capture-mut-ref.rs b/tests/ui/nll/capture-mut-ref.rs
new file mode 100644
index 00000000000..56e01f7b776
--- /dev/null
+++ b/tests/ui/nll/capture-mut-ref.rs
@@ -0,0 +1,16 @@
+// run-rustfix
+
+// Check that capturing a mutable reference by move and assigning to its
+// referent doesn't make the unused mut lint think that it is mutable.
+
+#![deny(unused_mut)]
+
+pub fn mutable_upvar() {
+    let mut x = &mut 0;
+    //~^ ERROR
+    let _ = move || {
+        *x = 1;
+    };
+}
+
+fn main() {}