Auto merge of #22541 - Manishearth:rollup, r=Gankro 1.0.0-alpha.2

Continued from #22520

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() { }