Auto merge of #35680 - GuillaumeGomez:err_codes, r=jonathandturner

Err codes

r? @jonathandturner

Author: bors

src/librustc_mir/diagnostics.rs

@@ -188,12 +188,30 @@ avoid mutation if possible.
 "##,
 
 E0394: r##"
-From [RFC 246]:
+A static was referred to by value by another static.
 
- > It is invalid for a static to reference another static by value. It is
- > required that all references be borrowed.
+Erroneous code examples:
 
-[RFC 246]: https://github.com/rust-lang/rfcs/pull/246
+```compile_fail,E0394
+static A: u32 = 0;
+static B: u32 = A; // error: cannot refer to other statics by value, use the
+                   //        address-of operator or a constant instead
+```
+
+A static cannot be referred by value. To fix this issue, either use a
+constant:
+
+```
+const A: u32 = 0; // `A` is now a constant
+static B: u32 = A; // ok!
+```
+
+Or refer to `A` by reference:
+
+```
+static A: u32 = 0;
+static B: &'static u32 = &A; // ok!
+```
 "##,
 
 

src/test/compile-fail/E0394.rs

@@ -0,0 +1,15 @@
+// Copyright 2016 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.
+
+static A: u32 = 0;
+static B: u32 = A; //~ ERROR E0394
+
+fn main() {
+}

src/test/compile-fail/E0395.rs

@@ -0,0 +1,17 @@
+// Copyright 2016 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.
+
+static FOO: i32 = 42;
+static BAR: i32 = 42;
+
+static BAZ: bool = { (&FOO as *const i32) == (&BAR as *const i32) }; //~ ERROR E0395
+
+fn main() {
+}

src/test/compile-fail/E0396.rs

@@ -0,0 +1,16 @@
+// Copyright 2016 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.
+
+const REG_ADDR: *const u8 = 0x5f3759df as *const u8;
+
+const VALUE: u8 = unsafe { *REG_ADDR }; //~ ERROR E0396
+
+fn main() {
+}

src/test/compile-fail/E0401.rs

@@ -0,0 +1,18 @@
+// Copyright 2016 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 foo<T>(x: T) {
+    fn bar(y: T) { //~ ERROR E0401
+    }
+    bar(x);
+}
+
+fn main() {
+}

src/test/compile-fail/E0403.rs

@@ -0,0 +1,14 @@
+// Copyright 2016 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 foo<T, T>(s: T, u: T) {} //~ ERROR E0403
+
+fn main() {
+}

src/test/compile-fail/E0404.rs

@@ -0,0 +1,17 @@
+// Copyright 2016 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.
+
+struct Foo;
+struct Bar;
+
+impl Foo for Bar {} //~ ERROR E0404
+
+fn main() {
+}

src/test/compile-fail/E0405.rs

@@ -0,0 +1,16 @@
+// Copyright 2016 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.
+
+struct Foo;
+
+impl SomeTrait for Foo {} //~ ERROR E0405
+
+fn main() {
+}

src/test/compile-fail/E0407.rs

@@ -0,0 +1,23 @@
+// Copyright 2016 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 {
+    fn a();
+}
+
+struct Bar;
+
+impl Foo for Bar {
+    fn a() {}
+    fn b() {} //~ ERROR E0407
+}
+
+fn main() {
+}

src/test/compile-fail/E0408.rs

@@ -0,0 +1,18 @@
+// Copyright 2016 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() {
+    let x = Some(0);
+
+    match x {
+        Some(y) | None => {} //~ ERROR E0408
+        _ => ()
+    }
+}