rust/src/test/compile-fail/variance-trait-bounds.rs
2016-08-17 06:32:00 +03:00

65 lines
1.5 KiB
Rust

// Copyright 2014 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.
#![allow(dead_code)]
#![feature(rustc_attrs)]
// Check that bounds on type parameters (other than `Self`) do not
// influence variance.
#[rustc_variance]
trait Getter<T> { //~ ERROR types=[o, o]
fn get(&self) -> T;
}
#[rustc_variance]
trait Setter<T> { //~ ERROR types=[o, o]
fn get(&self, T);
}
#[rustc_variance]
struct TestStruct<U,T:Setter<U>> { //~ ERROR types=[+, +]
t: T, u: U
}
#[rustc_variance]
enum TestEnum<U,T:Setter<U>> {//~ ERROR types=[*, +]
//~^ ERROR parameter `U` is never used
Foo(T)
}
#[rustc_variance]
trait TestTrait<U,T:Setter<U>> { //~ ERROR types=[o, o, o]
fn getter(&self, u: U) -> T;
}
#[rustc_variance]
trait TestTrait2<U> : Getter<U> { //~ ERROR types=[o, o]
}
#[rustc_variance]
trait TestTrait3<U> { //~ ERROR types=[o, o]
fn getter<T:Getter<U>>(&self);
}
#[rustc_variance]
struct TestContraStruct<U,T:Setter<U>> { //~ ERROR types=[*, +]
//~^ ERROR parameter `U` is never used
t: T
}
#[rustc_variance]
struct TestBox<U,T:Getter<U>+Setter<U>> { //~ ERROR types=[*, +]
//~^ ERROR parameter `U` is never used
t: T
}
pub fn main() { }