Auto merge of #42809 - seanmonstar:stable-associated-consts, r=nikomatsakis

remove associated_consts feature gate

Currently struggling to run tests locally (something about jemalloc target missing).

cc #29646

Author: bors

src/doc/unstable-book/src/language-features/associated-consts.md

@@ -70,7 +70,6 @@
 #![feature(allow_internal_unstable)]
 #![feature(asm)]
 #![feature(associated_type_defaults)]
-#![feature(associated_consts)]
 #![feature(cfg_target_feature)]
 #![feature(cfg_target_has_atomic)]
 #![feature(concat_idents)]
@@ -94,6 +93,8 @@
 #![feature(untagged_unions)]
 #![feature(unwind_attributes)]
 
+#![cfg_attr(stage0, feature(associated_consts))]
+
 #[prelude_import]
 #[allow(unused)]
 use prelude::v1::*;

src/libcore/lib.rs

@@ -22,7 +22,6 @@
        html_root_url = "https://doc.rust-lang.org/nightly/")]
 #![deny(warnings)]
 
-#![feature(associated_consts)]
 #![feature(box_patterns)]
 #![feature(box_syntax)]
 #![feature(conservative_impl_trait)]
@@ -42,6 +41,8 @@
 #![feature(trace_macros)]
 #![feature(test)]
 
+#![cfg_attr(stage0, feature(associated_consts))]
+
 #![recursion_limit="256"]
 
 extern crate arena;

src/librustc/lib.rs

@@ -10,11 +10,12 @@
 
 
 #![crate_name = "rustc_bitflags"]
-#![feature(associated_consts)]
 #![crate_type = "rlib"]
 #![no_std]
 #![deny(warnings)]
 
+#![cfg_attr(stage0, feature(associated_consts))]
+
 //! A typesafe bitmask flag generator.
 
 #[cfg(test)]
@@ -31,7 +32,6 @@ extern crate std;
 ///
 /// ```{.rust}
 /// #![feature(rustc_private)]
-/// #![feature(associated_consts)]
 /// #[macro_use] extern crate rustc_bitflags;
 ///
 /// bitflags! {

src/librustc_bitflags/lib.rs

@@ -20,7 +20,8 @@
 
 #![feature(quote)]
 #![feature(rustc_diagnostic_macros)]
-#![feature(associated_consts)]
+
+#![cfg_attr(stage0, feature(associated_consts))]
 
 #[macro_use] extern crate log;
 #[macro_use] extern crate syntax;

src/librustc_borrowck/lib.rs

@@ -29,14 +29,14 @@
 #![feature(nonzero)]
 #![feature(unboxed_closures)]
 #![feature(fn_traits)]
-#![feature(associated_consts)]
 #![feature(unsize)]
 #![feature(i128_type)]
 #![feature(conservative_impl_trait)]
 #![feature(discriminant_value)]
 #![feature(specialization)]
 #![feature(manually_drop)]
 
+#![cfg_attr(stage0, feature(associated_consts))]
 #![cfg_attr(stage0, feature(struct_field_attributes))]
 
 #![cfg_attr(unix, feature(libc))]

src/librustc_data_structures/lib.rs

@@ -21,13 +21,14 @@
        html_root_url = "https://doc.rust-lang.org/nightly/")]
 #![deny(warnings)]
 
-#![feature(associated_consts)]
 #![feature(box_syntax)]
 #![feature(concat_idents)]
 #![feature(libc)]
 #![feature(link_args)]
 #![feature(static_nobundle)]
 
+#![cfg_attr(stage0, feature(associated_consts))]
+
 extern crate libc;
 #[macro_use]
 #[no_link]

src/librustc_llvm/lib.rs

@@ -19,7 +19,6 @@ Rust MIR: a lowered representation of Rust. Also: an experiment!
 #![crate_type = "dylib"]
 #![deny(warnings)]
 
-#![feature(associated_consts)]
 #![feature(box_patterns)]
 #![feature(box_syntax)]
 #![feature(i128_type)]
@@ -28,6 +27,8 @@ Rust MIR: a lowered representation of Rust. Also: an experiment!
 #![feature(collection_placement)]
 #![feature(nonzero)]
 
+#![cfg_attr(stage0, feature(associated_consts))]
+
 #[macro_use] extern crate log;
 extern crate graphviz as dot;
 #[macro_use]

src/librustc_mir/lib.rs

@@ -1320,8 +1320,6 @@ match the name of any associated constant in the trait.
 Erroneous code example:
 
 ```compile_fail,E0438
-#![feature(associated_consts)]
-
 trait Foo {}
 
 impl Foo for i32 {

src/librustc_resolve/diagnostics.rs

@@ -16,9 +16,10 @@
       html_root_url = "https://doc.rust-lang.org/nightly/")]
 #![deny(warnings)]
 
-#![feature(associated_consts)]
 #![feature(rustc_diagnostic_macros)]
 
+#![cfg_attr(stage0, feature(associated_consts))]
+
 #[macro_use]
 extern crate log;
 #[macro_use]