1 files changed, 31 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-40288-2.rs b/tests/ui/issues/issue-40288-2.rs
new file mode 100644
index 00000000000..032a2e65ff0
--- /dev/null
+++ b/tests/ui/issues/issue-40288-2.rs
@@ -0,0 +1,31 @@
+fn prove_static<T: 'static + ?Sized>(_: &'static T) {}
+
+fn lifetime_transmute_slice<'a, T: ?Sized>(x: &'a T, y: &T) -> &'a T {
+    let mut out = [x];
+    {
+        let slice: &mut [_] = &mut out;
+        slice[0] = y;
+    }
+    out[0]
+    //~^ ERROR explicit lifetime required in the type of `y` [E0621]
+}
+
+struct Struct<T, U: ?Sized> {
+    head: T,
+    _tail: U
+}
+
+fn lifetime_transmute_struct<'a, T: ?Sized>(x: &'a T, y: &T) -> &'a T {
+    let mut out = Struct { head: x, _tail: [()] };
+    {
+        let dst: &mut Struct<_, [()]> = &mut out;
+        dst.head = y;
+    }
+    out.head
+    //~^ ERROR explicit lifetime required in the type of `y` [E0621]
+}
+
+fn main() {
+    prove_static(lifetime_transmute_slice("", &String::from("foo")));
+    prove_static(lifetime_transmute_struct("", &String::from("bar")));
+}