| // Copyright 2018 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| |
| #![feature(existential_type)] |
| |
| fn main() {} |
| |
| existential type Underconstrained<T: std::fmt::Debug>: 'static; |
| //~^ ERROR `U` doesn't implement `std::fmt::Debug` |
| |
| // not a defining use, because it doesn't define *all* possible generics |
| fn underconstrained<U>(_: U) -> Underconstrained<U> { |
| 5u32 |
| } |
| |
| existential type Underconstrained2<T: std::fmt::Debug>: 'static; |
| //~^ ERROR `V` doesn't implement `std::fmt::Debug` |
| |
| // not a defining use, because it doesn't define *all* possible generics |
| fn underconstrained2<U, V>(_: U, _: V) -> Underconstrained2<V> { |
| 5u32 |
| } |
