1 files changed, 8 insertions, 0 deletions
diff --git a/tests/ui/mut/mut-cross-borrowing.rs b/tests/ui/mut/mut-cross-borrowing.rs
new file mode 100644
index 000000000..080faab73
--- /dev/null
+++ b/tests/ui/mut/mut-cross-borrowing.rs
@@ -0,0 +1,8 @@
+fn f(_: &mut isize) {}
+
+fn main() {
+
+    let mut x: Box<_> = Box::new(3);
+
+    f(x)    //~ ERROR mismatched types
+}