1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 // Test that we correctly infer variance for type parameters in
12 // various types and traits.
14 #![feature(rustc_attrs)]
17 struct TestImm<A, B> { //~ ERROR types=[[+, +];[];[]]
23 struct TestMut<A, B:'static> { //~ ERROR types=[[+, o];[];[]]
29 struct TestIndirect<A:'static, B:'static> { //~ ERROR types=[[+, o];[];[]]
34 struct TestIndirect2<A:'static, B:'static> { //~ ERROR types=[[o, o];[];[]]
40 trait Getter<A> { //~ ERROR types=[[+];[-];[]]
45 trait Setter<A> { //~ ERROR types=[[-];[o];[]]
46 fn set(&mut self, a: A);
50 trait GetterSetter<A> { //~ ERROR types=[[o];[o];[]]
52 fn set(&mut self, a: A);
56 trait GetterInTypeBound<A> { //~ ERROR types=[[-];[-];[]]
57 // Here, the use of `A` in the method bound *does* affect
58 // variance. Think of it as if the method requested a dictionary
59 // for `T:Getter<A>`. Since this dictionary is an input, it is
60 // contravariant, and the Getter is covariant w/r/t A, yielding an
61 // overall contravariant result.
62 fn do_it<T:Getter<A>>(&self);
66 trait SetterInTypeBound<A> { //~ ERROR types=[[+];[-];[]]
67 fn do_it<T:Setter<A>>(&self);
71 struct TestObject<A, R> { //~ ERROR types=[[-, +];[];[]]
72 n: Box<Setter<A>+Send>,
73 m: Box<Getter<R>+Send>,