| // Copyright 2015 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(specialization)] |
| |
| // Check a number of scenarios in which one impl tries to override another, |
| // without correctly using `default`. |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // Test 1: one layer of specialization, multiple methods, missing `default` |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| trait Foo { |
| fn foo(&self); |
| fn bar(&self); |
| } |
| |
| impl<T> Foo for T { |
| fn foo(&self) {} |
| fn bar(&self) {} |
| } |
| |
| impl Foo for u8 {} |
| impl Foo for u16 { |
| fn foo(&self) {} //~ ERROR E0520 |
| } |
| impl Foo for u32 { |
| fn bar(&self) {} //~ ERROR E0520 |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // Test 2: one layer of specialization, missing `default` on associated type |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| trait Bar { |
| type T; |
| } |
| |
| impl<T> Bar for T { |
| type T = u8; |
| } |
| |
| impl Bar for u8 { |
| type T = (); //~ ERROR E0520 |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // Test 3a: multiple layers of specialization, missing interior `default` |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| trait Baz { |
| fn baz(&self); |
| } |
| |
| default impl<T> Baz for T { |
| fn baz(&self) {} |
| } |
| |
| impl<T: Clone> Baz for T { |
| fn baz(&self) {} |
| } |
| |
| impl Baz for i32 { |
| fn baz(&self) {} //~ ERROR E0520 |
| } |
| |
| //////////////////////////////////////////////////////////////////////////////// |
| // Test 3b: multiple layers of specialization, missing interior `default`, |
| // redundant `default` in bottom layer. |
| //////////////////////////////////////////////////////////////////////////////// |
| |
| trait Redundant { |
| fn redundant(&self); |
| } |
| |
| default impl<T> Redundant for T { |
| fn redundant(&self) {} |
| } |
| |
| impl<T: Clone> Redundant for T { |
| fn redundant(&self) {} |
| } |
| |
| default impl Redundant for i32 { |
| fn redundant(&self) {} //~ ERROR E0520 |
| } |
| |
| fn main() {} |