Rollup merge of rust-lang#42016 - pietroalbini:stabilize/loop_break_value, r=nikomatsakis

Stabilize the loop_break_value feature

Tracking issue: rust-lang#37339.

Documentation PRs already sent to the various repositories.

Author: frewsxcv

src/doc/unstable-book/src/SUMMARY.md

@@ -49,7 +49,6 @@
     - [link_llvm_intrinsics](language-features/link-llvm-intrinsics.md)
     - [linkage](language-features/linkage.md)
     - [log_syntax](language-features/log-syntax.md)
-    - [loop_break_value](language-features/loop-break-value.md)
     - [macro_reexport](language-features/macro-reexport.md)
     - [macro_vis_matcher](language-features/macro-vis-matcher.md)
     - [main](language-features/main.md)

src/doc/unstable-book/src/language-features/loop-break-value.md

@@ -30,7 +30,6 @@
 #![feature(core_intrinsics)]
 #![feature(i128_type)]
 #![feature(libc)]
-#![feature(loop_break_value)]
 #![feature(never_type)]
 #![feature(nonzero)]
 #![feature(quote)]
@@ -45,6 +44,7 @@
 #![cfg_attr(stage0, unstable(feature = "rustc_private", issue = "27812"))]
 #![cfg_attr(stage0, feature(rustc_private))]
 #![cfg_attr(stage0, feature(staged_api))]
+#![cfg_attr(stage0, feature(loop_break_value))]
 
 #![recursion_limit="128"]
 

src/librustc/lib.rs

@@ -23,7 +23,6 @@
 #![deny(warnings)]
 
 #![feature(box_syntax)]
-#![feature(loop_break_value)]
 #![feature(libc)]
 #![feature(quote)]
 #![feature(rustc_diagnostic_macros)]
@@ -32,6 +31,7 @@
 #![cfg_attr(stage0, unstable(feature = "rustc_private", issue = "27812"))]
 #![cfg_attr(stage0, feature(rustc_private))]
 #![cfg_attr(stage0, feature(staged_api))]
+#![cfg_attr(stage0, feature(loop_break_value))]
 
 extern crate arena;
 extern crate getopts;

src/librustc_driver/lib.rs

@@ -76,14 +76,14 @@ This API is completely unstable and subject to change.
 #![feature(box_patterns)]
 #![feature(box_syntax)]
 #![feature(conservative_impl_trait)]
-#![feature(loop_break_value)]
 #![feature(never_type)]
 #![feature(quote)]
 #![feature(rustc_diagnostic_macros)]
 
 #![cfg_attr(stage0, unstable(feature = "rustc_private", issue = "27812"))]
 #![cfg_attr(stage0, feature(rustc_private))]
 #![cfg_attr(stage0, feature(staged_api))]
+#![cfg_attr(stage0, feature(loop_break_value))]
 
 #[macro_use] extern crate log;
 #[macro_use] extern crate syntax;

src/librustc_typeck/lib.rs

@@ -297,9 +297,6 @@ declare_features! (
 
     (active, use_extern_macros, "1.15.0", Some(35896)),
 
-    // Allows `break {expr}` with a value inside `loop`s.
-    (active, loop_break_value, "1.14.0", Some(37339)),
-
     // Allows #[target_feature(...)]
     (active, target_feature, "1.15.0", None),
 
@@ -423,6 +420,8 @@ declare_features! (
     (accepted, pub_restricted, "1.18.0", Some(32409)),
     // The #![windows_subsystem] attribute
     (accepted, windows_subsystem, "1.18.0", Some(37499)),
+    // Allows `break {expr}` with a value inside `loop`s.
+    (accepted, loop_break_value, "1.19.0", Some(37339)),
 );
 // If you change this, please modify src/doc/unstable-book as well. You must
 // move that documentation into the relevant place in the other docs, and
@@ -1301,10 +1300,6 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
                     }
                 }
             }
-            ast::ExprKind::Break(_, Some(_)) => {
-                gate_feature_post!(&self, loop_break_value, e.span,
-                                   "`break` with a value is experimental");
-            }
             ast::ExprKind::Lit(ref lit) => {
                 if let ast::LitKind::Int(_, ref ty) = lit.node {
                     match *ty {

src/libsyntax/feature_gate.rs

@@ -8,7 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(loop_break_value)]
 #![feature(never_type)]
 
 fn main() {

src/test/compile-fail/feature-gate-loop-break-value.rs

@@ -15,7 +15,6 @@
 // like to revisit these and potentially change them. --nmatsakis
 
 #![feature(never_type)]
-#![feature(loop_break_value)]
 
 trait BadDefault {
     fn default() -> Self;

src/test/compile-fail/loop-break-value.rs

@@ -8,7 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(loop_break_value)]
 #![feature(never_type)]
 
 #[allow(unused)]