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// check-pass
// compile-flags:-Zpolymorphize=on
pub struct OnDrop<F: Fn()>(pub F);
impl<F: Fn()> Drop for OnDrop<F> {
fn drop(&mut self) { }
}
fn bar<F: FnOnce()>(f: F) {
let _ = OnDrop(|| ());
f()
fn foo<R, S: FnOnce()>(
_: R,
_: S,
) {
let bar = || {
bar(|| {})
};
let _ = bar();
fn main() {
foo(3u32, || {});