rust/src/test/run-pass/issue-2550.rs

struct C {
    let x: uint;

}

fn C(x: uint) -> C {
    C {
        x: x
    }
}

fn f<T:copy>(_x: T) {
}

#[deny(non_implicitly_copyable_typarams)]
fn main() {
    f(C(1u));
}