src/test/ui/wf/wf-in-fn-ret.rs

// Check that we enforce WF conditions also for return types in fn items.

#![feature(rustc_attrs)]
#![allow(dead_code)]

struct MustBeCopy<T:Copy> {
    t: T
}

fn bar<T>() -> MustBeCopy<T> //~ ERROR E0277
{
}

fn main() { }