1 files changed, 16 insertions, 0 deletions
diff --git a/tests/ui/let-else/let-else-binding-explicit-mut-annotated.rs b/tests/ui/let-else/let-else-binding-explicit-mut-annotated.rs
new file mode 100644
index 000000000..955f33ee1
--- /dev/null
+++ b/tests/ui/let-else/let-else-binding-explicit-mut-annotated.rs
@@ -0,0 +1,16 @@
+// from rfc2005 test suite
+
+
+
+// Verify the binding mode shifts - only when no `&` are auto-dereferenced is the
+// final default binding mode mutable.
+
+fn main() {
+    let Some(n): &mut Option<i32> = &&Some(5i32) else { return }; //~ ERROR mismatched types
+    *n += 1;
+    let _ = n;
+
+    let Some(n): &mut Option<i32> = &&mut Some(5i32) else { return }; //~ ERROR mismatched types
+    *n += 1;
+    let _ = n;
+}