Auto merge of #51562 - SimonSapin:transparent, r=cramertj

Stabilize #[repr(transparent)]

Tracking issue FCP: https://github.com/rust-lang/rust/issues/43036#issuecomment-394094318
Reference PR: https://github.com/rust-lang-nursery/reference/pull/353

src/test/codegen/repr-transparent-aggregates-1.rs

@@ -18,7 +18,6 @@
 // See repr-transparent.rs
 
 #![crate_type="lib"]
-#![feature(repr_transparent)]
 
 
 #[repr(C)]

src/test/codegen/repr-transparent-aggregates-2.rs

@@ -22,7 +22,6 @@
 // See repr-transparent.rs
 
 #![crate_type="lib"]
-#![feature(repr_transparent)]
 
 
 #[repr(C)]

src/test/codegen/repr-transparent-aggregates-3.rs

@@ -14,7 +14,6 @@
 // See repr-transparent.rs
 
 #![crate_type="lib"]
-#![feature(repr_transparent)]
 
 
 #[repr(C)]

src/test/codegen/repr-transparent-sysv64.rs

@@ -13,7 +13,6 @@
 // compile-flags: -C no-prepopulate-passes
 
 #![crate_type="lib"]
-#![feature(repr_transparent)]
 
 #[repr(C)]
 pub struct Rgb8 { r: u8, g: u8, b: u8 }

src/test/codegen/repr-transparent.rs

@@ -11,7 +11,7 @@
 // compile-flags: -C no-prepopulate-passes
 
 #![crate_type="lib"]
-#![feature(repr_transparent, repr_simd)]
+#![feature(repr_simd)]
 
 use std::marker::PhantomData;
 

src/test/compile-fail/repr-transparent-other-items.rs

@@ -8,8 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(repr_transparent)]
-
 // See also repr-transparent.rs
 
 #[repr(transparent)] //~ ERROR unsupported representation for zero-variant enum

src/test/compile-fail/repr-transparent-other-reprs.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(repr_transparent, repr_align, attr_literals)]
+#![feature(repr_align, attr_literals)]
 
 // See also repr-transparent.rs
 

src/test/compile-fail/repr-transparent.rs

@@ -14,7 +14,6 @@
 // - repr-transparent-other-items.rs
 
 #![feature(repr_align, attr_literals)]
-#![feature(repr_transparent)]
 
 use std::marker::PhantomData;
 

src/test/ui/feature-gate-repr_transparent.rs

@@ -1,14 +0,0 @@
-// 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.
-
-#[repr(transparent)] //~ error: the `#[repr(transparent)]` attribute is experimental
-struct Foo(u64);
-
-fn main() {}

src/test/ui/feature-gate-repr_transparent.stderr

@@ -1,11 +0,0 @@
-error[E0658]: the `#[repr(transparent)]` attribute is experimental (see issue #43036)
-  --> $DIR/feature-gate-repr_transparent.rs:11:1
-   |
-LL | #[repr(transparent)] //~ error: the `#[repr(transparent)]` attribute is experimental
-   | ^^^^^^^^^^^^^^^^^^^^
-   |
-   = help: add #![feature(repr_transparent)] to the crate attributes to enable
-
-error: aborting due to previous error
-
-For more information about this error, try `rustc --explain E0658`.

src/test/ui/lint-ctypes.rs

@@ -9,7 +9,7 @@
 // except according to those terms.
 
 #![deny(improper_ctypes)]
-#![feature(libc, repr_transparent)]
+#![feature(libc)]
 
 extern crate libc;