Unsupported closure + dyn

[ranjitjhala]

Via @enjhnsn2

I found a minimized example that triggers the error. Unfortunately its a little more complicated:

pub trait Animal {
    fn noise(&self);
}

fn apply_closure_to_animal<F>(closure: F, animal: &'static dyn Animal)
where
    F: FnOnce(&dyn Animal),
{
    closure(animal);
}

This bug isn't too frequent and is possible to work around, so I don't think you should block this pr on it.

Originally posted by @enjhnsn2 in #664 (comment)

[ranjitjhala]

Seems to work now -- I think fixed by #664 see this test, so closing ping @enjhnsn2