1 files changed, 19 insertions, 0 deletions
diff --git a/tests/ui/unsized/issue-91801.rs b/tests/ui/unsized/issue-91801.rs
new file mode 100644
index 000000000..096b1a935
--- /dev/null
+++ b/tests/ui/unsized/issue-91801.rs
@@ -0,0 +1,19 @@
+pub struct Something;
+
+type Validator<'a> = dyn 'a + Send + Sync + Fn(&'a Something) -> Result<(), ()>;
+
+pub static ALL_VALIDATORS: &[(&'static str, &'static Validator)] =
+    &[("validate that credits and debits balance", &validate_something)];
+
+fn or<'a>(first: &'static Validator<'a>, second: &'static Validator<'a>) -> Validator<'a> {
+    //~^ ERROR return type cannot have an unboxed trait object
+    return Box::new(move |something: &'_ Something| -> Result<(), ()> {
+        first(something).or_else(|_| second(something))
+    });
+}
+
+fn validate_something(_: &Something) -> Result<(), ()> {
+    Ok(())
+}
+
+fn main() {}