1 files changed, 18 insertions, 0 deletions
diff --git a/src/test/ui/unboxed-closures/unboxed-closures-prelude.rs b/src/test/ui/unboxed-closures/unboxed-closures-prelude.rs
new file mode 100644
index 000000000..89a273b7a
--- /dev/null
+++ b/src/test/ui/unboxed-closures/unboxed-closures-prelude.rs
@@ -0,0 +1,18 @@
+// run-pass
+// Tests that the re-exports of `FnOnce` et al from the prelude work.
+
+// pretty-expanded FIXME #23616
+
+fn main() {
+    let task: Box<dyn Fn(isize) -> isize> = Box::new(|x| x);
+    task(0);
+
+    let mut task: Box<dyn FnMut(isize) -> isize> = Box::new(|x| x);
+    task(0);
+
+    call(|x| x, 22);
+}
+
+fn call<F:FnOnce(isize) -> isize>(f: F, x: isize) -> isize {
+    f(x)
+}