src/test/ui/kindck/kindck-impl-type-params-2.rs

#![feature(box_syntax)]

trait Foo {
}

impl<T:Copy> Foo for T {
}

fn take_param<T:Foo>(foo: &T) { }

fn main() {
    let x: Box<_> = box 3;
    take_param(&x);
    //~^ ERROR the trait bound `std::boxed::Box<{integer}>: Foo` is not satisfied
}