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// check-pass
pub trait Fooey: Sized {
type Context<'c> where Self: 'c;
}
pub struct Handle<E: Fooey>(Option<Box<dyn for<'c> Fn(&mut E::Context<'c>)>>);
fn tuple<T>() -> (Option<T>,) { (Option::None,) }
pub struct FooImpl {}
impl Fooey for FooImpl {
type Context<'c> = &'c ();
}
impl FooImpl {
pub fn fail1() -> Handle<Self> {
let (tx,) = tuple();
Handle(tx)
}
}
fn main() {}
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