| // 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. |
| |
| // Issue 52985: Cause cycle error if user code provides no use case that allows an existential type |
| // to be inferred to a concrete type. This results in an infinite cycle during type normalization. |
| |
| #![feature(existential_type)] |
| |
| existential type Foo: Copy; //~ cycle detected |
| |
| // make compiler happy about using 'Foo' |
| fn bar(x: Foo) -> Foo { x } |
| |
| fn main() { |
| let _: Foo = std::mem::transmute(0u8); |
| } |
