| // Copyright 2012 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 we correctly infer variance for region parameters in |
| // case that involve multiple intricate types. |
| // Try enums too. |
| |
| #![feature(rustc_attrs)] |
| |
| #[rustc_variance] |
| enum Base<'a, 'b, 'c:'b, 'd> { //~ ERROR [+, -, o, *] |
| Test8A(extern "Rust" fn(&'a isize)), |
| Test8B(&'b [isize]), |
| Test8C(&'b mut &'c str), |
| } |
| |
| #[rustc_variance] |
| struct Derived1<'w, 'x:'y, 'y, 'z> { //~ ERROR [*, o, -, +] |
| f: Base<'z, 'y, 'x, 'w> |
| } |
| |
| #[rustc_variance] // Combine - and + to yield o |
| struct Derived2<'a, 'b:'a, 'c> { //~ ERROR [o, o, *] |
| f: Base<'a, 'a, 'b, 'c> |
| } |
| |
| #[rustc_variance] // Combine + and o to yield o (just pay attention to 'a here) |
| struct Derived3<'a:'b, 'b, 'c> { //~ ERROR [o, -, *] |
| f: Base<'a, 'b, 'a, 'c> |
| } |
| |
| #[rustc_variance] // Combine + and * to yield + (just pay attention to 'a here) |
| struct Derived4<'a, 'b, 'c:'b> { //~ ERROR [+, -, o] |
| f: Base<'a, 'b, 'c, 'a> |
| } |
| |
| fn main() {} |