src/test/ui/typeck/issue-57673-ice-on-deref-of-boxed-trait.rs

//extern crate has_assoc_type;

//fn ice(x: Box<dyn has_assoc_type::Foo<Assoc=()>>) {
fn ice(x: Box<dyn Iterator<Item=()>>) {
    *x //~ ERROR mismatched types [E0308]
}
fn main() {}