| // Copyright 2016 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. |
| |
| // Test that attempts to construct infinite types via impl trait fail |
| // in a graceful way. |
| // |
| // Regression test for #38064. |
| |
| // error-pattern:overflow evaluating the requirement `impl Quux` |
| |
| trait Quux {} |
| |
| fn foo() -> impl Quux { |
| struct Foo<T>(T); |
| impl<T> Quux for Foo<T> {} |
| Foo(bar()) |
| } |
| |
| fn bar() -> impl Quux { |
| struct Bar<T>(T); |
| impl<T> Quux for Bar<T> {} |
| Bar(foo()) |
| } |
| |
| // effectively: |
| // struct Foo(Bar); |
| // struct Bar(Foo); |
| // should produce an error about infinite size |
| |
| fn main() { foo(); } |
