1 // Copyright 2018 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
12 #![feature(existential_type)]
16 existential type Underconstrained<T: std::fmt::Debug>: 'static;
17 //~^ ERROR `U` doesn't implement `std::fmt::Debug`
19 // not a defining use, because it doesn't define *all* possible generics
20 fn underconstrained<U>(_: U) -> Underconstrained<U> {
24 existential type Underconstrained2<T: std::fmt::Debug>: 'static;
25 //~^ ERROR `V` doesn't implement `std::fmt::Debug`
27 // not a defining use, because it doesn't define *all* possible generics
28 fn underconstrained2<U, V>(_: U, _: V) -> Underconstrained2<V> {