1 files changed, 49 insertions, 0 deletions
diff --git a/tests/ui/borrowck/borrowck-uniq-via-ref.rs b/tests/ui/borrowck/borrowck-uniq-via-ref.rs
new file mode 100644
index 00000000000..bdf7cc57a53
--- /dev/null
+++ b/tests/ui/borrowck/borrowck-uniq-via-ref.rs
@@ -0,0 +1,49 @@
+// run-pass
+#![allow(dead_code)]
+
+// pretty-expanded FIXME #23616
+
+struct Rec {
+    f: Box<isize>,
+}
+
+struct Outer {
+    f: Inner
+}
+
+struct Inner {
+    g: Innermost
+}
+
+struct Innermost {
+    h: Box<isize>,
+}
+
+fn borrow(_v: &isize) {}
+
+fn box_mut(v: &mut Box<isize>) {
+    borrow(&**v); // OK: &mut -> &imm
+}
+
+fn box_mut_rec(v: &mut Rec) {
+    borrow(&*v.f); // OK: &mut -> &imm
+}
+
+fn box_mut_recs(v: &mut Outer) {
+    borrow(&*v.f.g.h); // OK: &mut -> &imm
+}
+
+fn box_imm(v: &Box<isize>) {
+    borrow(&**v); // OK
+}
+
+fn box_imm_rec(v: &Rec) {
+    borrow(&*v.f); // OK
+}
+
+fn box_imm_recs(v: &Outer) {
+    borrow(&*v.f.g.h); // OK
+}
+
+pub fn main() {
+}