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//@ check-pass
use std::fmt::Debug;
use std::iter::Once;
trait Lam<Binder> {
type App;
}
#[derive(Clone)]
struct L1;
impl<'a> Lam<&'a u8> for L1 {
type App = u8;
}
#[derive(Clone)]
struct L2;
impl<'a, 'b> Lam<&'a &'b u8> for L2 {
type App = u8;
}
trait Case1 {
type C: Clone + Iterator<Item: Send + Iterator<Item: for<'a> Lam<&'a u8, App: Debug>> + Sync>;
}
pub struct S1;
impl Case1 for S1 {
type C = Once<Once<L1>>;
}
fn assume_case1<T: Case1>() {
fn assert_c<_1, _2, C>()
where
C: Clone + Iterator<Item = _2>,
_2: Send + Iterator<Item = _1>,
_1: for<'a> Lam<&'a u8>,
for<'a> <_1 as Lam<&'a u8>>::App: Debug,
{
}
assert_c::<_, _, T::C>();
}
fn main() {
assume_case1::<S1>();
}
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