diff --git a/src/test/ui/typeck/issue-68590-reborrow-through-derefmut.rs b/src/test/ui/typeck/issue-68590-reborrow-through-derefmut.rs
new file mode 100644
index 0000000000000000000000000000000000000000..e4436260e70a07ac26d90c715b3995087ec58379
--- /dev/null
+++ b/src/test/ui/typeck/issue-68590-reborrow-through-derefmut.rs
@@ -0,0 +1,25 @@
+// check-pass
+
+// rust-lang/rust#68590: confusing diagnostics when reborrowing through DerefMut.
+
+use std::cell::RefCell;
+
+struct A;
+
+struct S<'a> {
+    a: &'a mut A,
+}
+
+fn take_a(_: &mut A) {}
+
+fn test<'a>(s: &RefCell<S<'a>>) {
+    let mut guard = s.borrow_mut();
+    take_a(guard.a);
+    let _s2 = S { a: guard.a };
+}
+
+fn main() {
+    let a = &mut A;
+    let s = RefCell::new(S { a });
+    test(&s);
+}
diff --git a/src/test/ui/typeck/issue-72225-call-fnmut-through-derefmut.rs b/src/test/ui/typeck/issue-72225-call-fnmut-through-derefmut.rs
new file mode 100644
index 0000000000000000000000000000000000000000..3ea05389f04a0b7ae8c2fdd3c8f31f34e37b1178
--- /dev/null
+++ b/src/test/ui/typeck/issue-72225-call-fnmut-through-derefmut.rs
@@ -0,0 +1,21 @@
+// check-pass
+
+// rust-lang/rust#72225: confusing diagnostics when calling FnMut through DerefMut.
+
+use std::cell::RefCell;
+
+struct S {
+    f: Box<dyn FnMut()>
+}
+
+fn test(s: &RefCell<S>) {
+    let mut guard = s.borrow_mut();
+    (guard.f)();
+}
+
+fn main() {
+    let s = RefCell::new(S {
+        f: Box::new(|| ())
+    });
+    test(&s);
+}