Add tests for ! type

Author: canndrew

src/test/compile-fail/call-fn-never-arg-wrong-type.rs

@@ -0,0 +1,20 @@
+// Copyright 2015 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(never_type)]
+
+fn foo(x: !) -> ! {
+    x
+}
+
+fn main() {
+    foo("wow"); //~ ERROR mismatched types
+}
+

src/test/compile-fail/never-assign-dead-code.rs

@@ -0,0 +1,18 @@
+// Copyright 2015 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(never_type)]
+#![deny(unused, unreachable_code)]
+
+fn main() {
+    let x: ! = panic!("aah"); //~ ERROR unused
+    drop(x); //~ ERROR unreachable
+}
+

src/test/compile-fail/never-assign-wrong-type.rs

@@ -0,0 +1,17 @@
+// Copyright 2015 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(never_type)]
+
+fn main() {
+    let x: ! = "hello"; //~ ERROR mismatched types
+}
+
+

src/test/compile-fail/never-disabled.rs

@@ -0,0 +1,26 @@
+// Copyright 2012 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.
+
+trait Foo {
+    type Wub;
+}
+
+type Ma = (u32, !, i32); //~ ERROR type is experimental
+type Meeshka = Vec<!>; //~ ERROR type is experimental
+type Mow = &fn(!) -> !; //~ ERROR type is experimental
+type Skwoz = &mut !; //~ ERROR type is experimental
+
+impl Foo for Meeshka {
+    type Wub = !; //~ ERROR type is experimental
+}
+
+fn main() {
+}
+

src/test/compile-fail/never-fallback.rs

@@ -0,0 +1,37 @@
+// Copyright 2015 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(never_type)]
+
+trait Balls: Sized {
+    fn smeg() -> Result<Self, ()>;
+}
+
+impl Balls for () {
+    fn smeg() -> Result<(), ()> { Ok(()) }
+}
+
+struct Flah;
+
+impl Flah {
+    fn flah<T: Balls>(&self) -> Result<T, ()> {
+        T::smeg()
+    }
+}
+
+fn doit() -> Result<(), ()> {
+    let _ = try!(Flah.flah()); //~ ERROR the trait bound
+    Ok(())
+}
+
+fn main() {
+    let _ = doit();
+}
+

src/test/run-fail/call-fn-never-arg.rs

@@ -0,0 +1,23 @@
+// Copyright 2012 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.
+
+// error-pattern:wowzers!
+
+#![feature(never_type)]
+#![allow(unreachable_code)]
+
+fn foo(x: !) -> ! {
+    x
+}
+
+fn main() {
+    foo(panic!("wowzers!"))
+}
+

src/test/run-fail/never-associated-type.rs

@@ -0,0 +1,32 @@
+// Copyright 2012 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(never_type)]
+
+// error-pattern:kapow!
+
+trait Foo {
+    type Wow;
+
+    fn smeg(&self) -> Self::Wow;
+}
+
+struct Blah;
+impl Foo for Blah {
+    type Wow = !;
+    fn smeg(&self) -> ! {
+        panic!("kapow!");
+    }
+}
+
+fn main() {
+    Blah.smeg();
+}
+

src/test/run-fail/never-type-arg.rs

@@ -0,0 +1,26 @@
+// Copyright 2012 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.
+
+// error-pattern:oh no!
+
+#![feature(never_type)]
+
+struct Wub;
+
+impl PartialEq<!> for Wub {
+    fn eq(&self, other: &!) -> bool {
+        *other
+    }
+}
+
+fn main() {
+    let _ = Wub == panic!("oh no!");
+}
+

src/test/run-pass/never-result.rs

@@ -0,0 +1,25 @@
+// Copyright 2015 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(never_type)]
+
+fn main() {
+    let x: Result<u32, !> = Ok(123);
+    match x {
+        Ok(z) => (),
+        Err(y) => {
+            let q: u32 = y;
+            let w: i32 = y;
+            let e: String = y;
+            y
+        },
+    }
+}
+

src/test/run-pass/unit-fallback.rs

@@ -0,0 +1,35 @@
+// Copyright 2015 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.
+
+trait Balls: Sized {
+    fn smeg() -> Result<Self, ()>;
+}
+
+impl Balls for () {
+    fn smeg() -> Result<(), ()> { Ok(()) }
+}
+
+struct Flah;
+
+impl Flah {
+    fn flah<T: Balls>(&self) -> Result<T, ()> {
+        T::smeg()
+    }
+}
+
+fn doit() -> Result<(), ()> {
+    let _ = try!(Flah.flah());
+    Ok(())
+}
+
+fn main() {
+    let _ = doit();
+}
+