1 files changed, 17 insertions, 0 deletions
diff --git a/tests/ui/traits/new-solver/builtin-fn-must-return-sized.rs b/tests/ui/traits/new-solver/builtin-fn-must-return-sized.rs
new file mode 100644
index 000000000..ba473653e
--- /dev/null
+++ b/tests/ui/traits/new-solver/builtin-fn-must-return-sized.rs
@@ -0,0 +1,17 @@
+// compile-flags: -Ztrait-solver=next
+
+#![feature(fn_traits)]
+#![feature(unboxed_closures)]
+#![feature(tuple_trait)]
+
+use std::ops::Fn;
+use std::marker::Tuple;
+
+fn foo<F: Fn<T>, T: Tuple>(f: Option<F>, t: T) {
+    let y = (f.unwrap()).call(t);
+}
+
+fn main() {
+    foo::<fn() -> str, _>(None, ());
+    //~^ expected a `Fn<_>` closure, found `fn() -> str`
+}