diff options
Diffstat (limited to 'src/test/compile-fail/variance-trait-bounds.rs')
| -rw-r--r-- | src/test/compile-fail/variance-trait-bounds.rs | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/src/test/compile-fail/variance-trait-bounds.rs b/src/test/compile-fail/variance-trait-bounds.rs new file mode 100644 index 00000000000..88b50058b65 --- /dev/null +++ b/src/test/compile-fail/variance-trait-bounds.rs @@ -0,0 +1,65 @@ +// 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. + +#![deny(bivariance)] +#![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=[[+];[-];[]] + fn get(&self) -> T; +} + +#[rustc_variance] +trait Setter<T> { //~ ERROR types=[[-];[-];[]] + 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=[[-, +];[-];[]] + fn getter(&self, u: U) -> T; +} + +#[rustc_variance] +trait TestTrait2<U> : Getter<U> { //~ ERROR types=[[+];[-];[]] +} + +#[rustc_variance] +trait TestTrait3<U> { //~ ERROR types=[[-];[-];[]] + 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() { } |
