Auto merge of #42724 - Mark-Simulacrum:tests, r=alexcrichton

Add tests for a few issues.

Fixes #41998
Fixes #38381
Fixes #37515
Fixes #37510
Fixes #37366
Fixes #37323
Fixes #37051
Fixes #36839
Fixes #35570
Fixes #34373
Fixes #34222

Certainly not all of the E-needstest issues right now, but I started to get bored.

src/test/compile-fail/issue-34222-1.rs

@@ -0,0 +1,13 @@
+// Copyright 2017 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.
+
+fn main() {
+    /// comment //~ ERROR found a documentation comment that doesn't document anything
+}

src/test/compile-fail/issue-34222.rs

@@ -0,0 +1,18 @@
+// Copyright 2017 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(rustc_attrs)]
+#![allow(warnings)]
+
+#[rustc_error]
+fn main() { //~ ERROR compilation successful
+    /// crash
+    let x = 0;
+}

src/test/compile-fail/issue-34373.rs

@@ -0,0 +1,21 @@
+// Copyright 2017 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(warnings)]
+
+trait Trait<T> {
+    fn foo(_: T) {}
+}
+
+pub struct Foo<T = Box<Trait<DefaultFoo>>>;
+type DefaultFoo = Foo; //~ ERROR unsupported cyclic reference
+
+fn main() {
+}

src/test/compile-fail/issue-35570.rs

@@ -0,0 +1,40 @@
+// Copyright 2017 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(rustc_attrs)]
+
+use std::mem;
+
+trait Trait1<T> {}
+trait Trait2<'a> {
+  type Ty;
+}
+
+fn _ice(param: Box<for <'a> Trait1<<() as Trait2<'a>>::Ty>>) {
+    let _e: (usize, usize) = unsafe{mem::transmute(param)};
+}
+
+trait Lifetime<'a> {
+    type Out;
+}
+impl<'a> Lifetime<'a> for () {
+    type Out = &'a ();
+}
+fn foo<'a>(x: &'a ()) -> <() as Lifetime<'a>>::Out {
+    x
+}
+
+fn takes_lifetime(_f: for<'a> fn(&'a ()) -> <() as Lifetime<'a>>::Out) {
+}
+
+#[rustc_error]
+fn main() { //~ ERROR compilation successful
+    takes_lifetime(foo);
+}

src/test/compile-fail/issue-36839.rs

@@ -0,0 +1,32 @@
+// Copyright 2017 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(rustc_attrs)]
+
+pub trait Foo {
+    type Bar;
+}
+
+pub trait Broken {
+    type Assoc;
+    fn broken(&self) where Self::Assoc: Foo;
+}
+
+impl<T> Broken for T {
+    type Assoc = ();
+    fn broken(&self) where Self::Assoc: Foo {
+        let _x: <Self::Assoc as Foo>::Bar;
+    }
+}
+
+#[rustc_error]
+fn main() { //~ ERROR compilation successful
+    let _m: &Broken<Assoc=()> = &();
+}

src/test/compile-fail/issue-37051.rs

@@ -0,0 +1,29 @@
+// Copyright 2017 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(rustc_attrs, associated_type_defaults)]
+#![allow(warnings)]
+
+trait State: Sized {
+    type NextState: State = StateMachineEnded;
+    fn execute(self) -> Option<Self::NextState>;
+}
+
+struct StateMachineEnded;
+
+impl State for StateMachineEnded {
+    fn execute(self) -> Option<Self::NextState> {
+        None
+    }
+}
+
+#[rustc_error]
+fn main() { //~ ERROR compilation successful
+}

src/test/compile-fail/issue-37323.rs

@@ -0,0 +1,28 @@
+// Copyright 2017 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(rustc_attrs)]
+#![allow(warnings)]
+
+#[derive(Debug)]
+struct Point {
+}
+
+struct NestedA<'a, 'b> {
+    x: &'a NestedB<'b>
+    //~^ ERROR E0491
+}
+
+struct NestedB<'a> {
+    x: &'a i32,
+}
+
+fn main() {
+}

src/test/compile-fail/issue-37366.rs

@@ -0,0 +1,26 @@
+// Copyright 2017 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.
+
+// ignore-emscripten
+
+#![feature(rustc_attrs, asm)]
+
+macro_rules! interrupt_handler {
+    () => {
+        unsafe fn _interrupt_handler() {
+            asm!("pop  eax" :::: "intel");
+        }
+    }
+}
+interrupt_handler!{}
+
+#[rustc_error]
+fn main() { //~ ERROR compilation successful
+}

src/test/compile-fail/issue-37510.rs

@@ -0,0 +1,25 @@
+// Copyright 2017 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(rustc_attrs)]
+
+fn foo(_: &mut i32) -> bool { true }
+
+#[rustc_error]
+fn main() { //~ ERROR compilation successful
+    let opt = Some(92);
+    let mut x = 62;
+
+    if let Some(_) = opt {
+
+    } else if foo(&mut x) {
+
+    }
+}

src/test/compile-fail/issue-37515.rs

@@ -0,0 +1,18 @@
+// Copyright 2017 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(rustc_attrs)]
+
+type Z = for<'x> Send;
+//~^ WARN type alias is never used
+
+#[rustc_error]
+fn main() { //~ ERROR compilation successful
+}

src/test/compile-fail/issue-38381.rs

@@ -0,0 +1,18 @@
+// Copyright 2017 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(rustc_attrs)]
+
+use std::ops::Deref;
+
+#[rustc_error]
+fn main() { //~ ERROR compilation successful
+    let _x: fn(&i32) -> <&i32 as Deref>::Target = unimplemented!();
+}

src/test/compile-fail/issue-41998.rs

@@ -0,0 +1,20 @@
+// Copyright 2017 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(rustc_attrs)]
+
+#[rustc_error]
+fn main() { //~ ERROR compilation successful
+    if ('x' as char) < ('y' as char) {
+        print!("x");
+    } else {
+        print!("y");
+    }
+}