Auto merge of #38679 - alexcrichton:always-deny-warnings, r=nrc

Remove not(stage0) from deny(warnings)

Historically this was done to accommodate bugs in lints, but there hasn't been a
bug in a lint since this feature was added which the warnings affected. Let's
completely purge warnings from all our stages by denying warnings in all stages.
This will also assist in tracking down `stage0` code to be removed whenever
we're updating the bootstrap compiler.

47 files changed, 47 insertions, 47 deletions

diff --git a/src/liballoc/lib.rs b/src/liballoc/lib.rs
index f9dfdc0e075..9ca9f93f3d3 100644
--- a/src/liballoc/lib.rs
+++ b/src/liballoc/lib.rs
@@ -70,7 +70,7 @@
        test(no_crate_inject, attr(allow(unused_variables), deny(warnings))))]
 #![no_std]
 #![needs_allocator]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(allocator)]
 #![feature(box_syntax)]
diff --git a/src/liballoc_jemalloc/lib.rs b/src/liballoc_jemalloc/lib.rs
index f2df393ad77..241f8149d24 100644
--- a/src/liballoc_jemalloc/lib.rs
+++ b/src/liballoc_jemalloc/lib.rs
@@ -16,7 +16,7 @@
             reason = "this library is unlikely to be stabilized in its current \
                       form or name",
             issue = "27783")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 #![feature(allocator)]
 #![feature(libc)]
 #![feature(staged_api)]
diff --git a/src/liballoc_system/lib.rs b/src/liballoc_system/lib.rs
index 5f0b637656b..de2b75f62b6 100644
--- a/src/liballoc_system/lib.rs
+++ b/src/liballoc_system/lib.rs
@@ -12,7 +12,7 @@
 #![crate_type = "rlib"]
 #![no_std]
 #![allocator]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 #![unstable(feature = "alloc_system",
             reason = "this library is unlikely to be stabilized in its current \
                       form or name",
diff --git a/src/libarena/lib.rs b/src/libarena/lib.rs
index 174a93ed23e..82ca989c9ef 100644
--- a/src/libarena/lib.rs
+++ b/src/libarena/lib.rs
@@ -26,7 +26,7 @@
        html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
        html_root_url = "https://doc.rust-lang.org/nightly/",
        test(no_crate_inject, attr(deny(warnings))))]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(alloc)]
 #![feature(core_intrinsics)]
diff --git a/src/libcollections/lib.rs b/src/libcollections/lib.rs
index f9746f5694a..ea2feac49f6 100644
--- a/src/libcollections/lib.rs
+++ b/src/libcollections/lib.rs
@@ -27,7 +27,7 @@
        test(no_crate_inject, attr(allow(unused_variables), deny(warnings))))]
 
 #![cfg_attr(test, allow(deprecated))] // rand
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(alloc)]
 #![feature(allow_internal_unstable)]
diff --git a/src/libcore/lib.rs b/src/libcore/lib.rs
index 2cb2f81fcff..35324f7b596 100644
--- a/src/libcore/lib.rs
+++ b/src/libcore/lib.rs
@@ -65,7 +65,7 @@
 #![no_core]
 #![deny(missing_docs)]
 #![deny(missing_debug_implementations)]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(allow_internal_unstable)]
 #![feature(asm)]
diff --git a/src/libflate/lib.rs b/src/libflate/lib.rs
index 3c608ef9c92..8365e9db2a9 100644
--- a/src/libflate/lib.rs
+++ b/src/libflate/lib.rs
@@ -22,7 +22,7 @@
        html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
        html_root_url = "https://doc.rust-lang.org/nightly/",
        test(attr(deny(warnings))))]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(libc)]
 #![feature(staged_api)]
diff --git a/src/libfmt_macros/lib.rs b/src/libfmt_macros/lib.rs
index b179a16e55e..f5a687de64e 100644
--- a/src/libfmt_macros/lib.rs
+++ b/src/libfmt_macros/lib.rs
@@ -23,7 +23,7 @@
        html_root_url = "https://doc.rust-lang.org/nightly/",
        html_playground_url = "https://play.rust-lang.org/",
        test(attr(deny(warnings))))]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(staged_api)]
 #![feature(unicode)]
diff --git a/src/libgetopts/lib.rs b/src/libgetopts/lib.rs
index 4d2f1b999a2..a5cd9fab2cf 100644
--- a/src/libgetopts/lib.rs
+++ b/src/libgetopts/lib.rs
@@ -90,6 +90,7 @@
        test(attr(deny(warnings))))]
 
 #![deny(missing_docs)]
+#![deny(warnings)]
 #![feature(staged_api)]
 
 use self::Name::*;
@@ -968,7 +969,6 @@ fn test_split_within() {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use super::Fail::*;
 
     use std::result::Result::{Err, Ok};
     use std::result;
diff --git a/src/libgraphviz/lib.rs b/src/libgraphviz/lib.rs
index 220051c9d35..8e587ad211d 100644
--- a/src/libgraphviz/lib.rs
+++ b/src/libgraphviz/lib.rs
@@ -292,7 +292,7 @@
        html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
        html_root_url = "https://doc.rust-lang.org/nightly/",
        test(attr(allow(unused_variables), deny(warnings))))]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(str_escape)]
 
diff --git a/src/liblog/lib.rs b/src/liblog/lib.rs
index 517cd016e8a..057df647c72 100644
--- a/src/liblog/lib.rs
+++ b/src/liblog/lib.rs
@@ -168,7 +168,7 @@
        html_playground_url = "https://play.rust-lang.org/",
        test(attr(deny(warnings))))]
 #![deny(missing_docs)]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(staged_api)]
 
diff --git a/src/libpanic_abort/lib.rs b/src/libpanic_abort/lib.rs
index 8f85bfe2c63..348180a48dc 100644
--- a/src/libpanic_abort/lib.rs
+++ b/src/libpanic_abort/lib.rs
@@ -21,7 +21,7 @@
        html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
        html_root_url = "https://doc.rust-lang.org/nightly/",
        issue_tracker_base_url = "https://github.com/rust-lang/rust/issues/")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(staged_api)]
 
diff --git a/src/libpanic_unwind/lib.rs b/src/libpanic_unwind/lib.rs
index b75d9ec6520..90f4b364482 100644
--- a/src/libpanic_unwind/lib.rs
+++ b/src/libpanic_unwind/lib.rs
@@ -30,7 +30,7 @@
        html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
        html_root_url = "https://doc.rust-lang.org/nightly/",
        issue_tracker_base_url = "https://github.com/rust-lang/rust/issues/")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(alloc)]
 #![feature(core_intrinsics)]
diff --git a/src/libproc_macro/lib.rs b/src/libproc_macro/lib.rs
index 22b365fa64f..93bc8674625 100644
--- a/src/libproc_macro/lib.rs
+++ b/src/libproc_macro/lib.rs
@@ -27,7 +27,7 @@
 #![stable(feature = "proc_macro_lib", since = "1.15.0")]
 #![crate_type = "rlib"]
 #![crate_type = "dylib"]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 #![deny(missing_docs)]
 
 #![feature(rustc_private)]
diff --git a/src/libproc_macro_plugin/lib.rs b/src/libproc_macro_plugin/lib.rs
index c45762bfb6e..0a7d3525848 100644
--- a/src/libproc_macro_plugin/lib.rs
+++ b/src/libproc_macro_plugin/lib.rs
@@ -80,7 +80,7 @@
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
        html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
        html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(staged_api)]
 #![feature(rustc_diagnostic_macros)]
diff --git a/src/libproc_macro_tokens/lib.rs b/src/libproc_macro_tokens/lib.rs
index 3bfa2fbb29f..0dd9aaab1c6 100644
--- a/src/libproc_macro_tokens/lib.rs
+++ b/src/libproc_macro_tokens/lib.rs
@@ -52,7 +52,7 @@
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
        html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
        html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(staged_api)]
 #![feature(rustc_private)]
diff --git a/src/librand/lib.rs b/src/librand/lib.rs
index c31a0ed5320..0cf70880d32 100644
--- a/src/librand/lib.rs
+++ b/src/librand/lib.rs
@@ -23,7 +23,7 @@
        html_root_url = "https://doc.rust-lang.org/nightly/",
        html_playground_url = "https://play.rust-lang.org/",
        test(attr(deny(warnings))))]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 #![no_std]
 #![unstable(feature = "rand",
             reason = "use `rand` from crates.io",
diff --git a/src/librustc/lib.rs b/src/librustc/lib.rs
index 73ec9d8f8c8..151d7cd17ab 100644
--- a/src/librustc/lib.rs
+++ b/src/librustc/lib.rs
@@ -21,7 +21,7 @@
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
        html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
        html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(associated_consts)]
 #![feature(box_patterns)]
diff --git a/src/librustc_back/lib.rs b/src/librustc_back/lib.rs
index 3dc577b3c64..000e4eb59bf 100644
--- a/src/librustc_back/lib.rs
+++ b/src/librustc_back/lib.rs
@@ -28,7 +28,7 @@
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
       html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
       html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(box_syntax)]
 #![feature(const_fn)]
diff --git a/src/librustc_bitflags/lib.rs b/src/librustc_bitflags/lib.rs
index e65d112430a..edd474b2e9e 100644
--- a/src/librustc_bitflags/lib.rs
+++ b/src/librustc_bitflags/lib.rs
@@ -15,7 +15,7 @@
 #![crate_type = "rlib"]
 #![no_std]
 #![unstable(feature = "rustc_private", issue = "27812")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 //! A typesafe bitmask flag generator.
 
diff --git a/src/librustc_borrowck/lib.rs b/src/librustc_borrowck/lib.rs
index 1ff232da427..d3b22884a3d 100644
--- a/src/librustc_borrowck/lib.rs
+++ b/src/librustc_borrowck/lib.rs
@@ -15,7 +15,7 @@
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
       html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
       html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![allow(non_camel_case_types)]
 
diff --git a/src/librustc_data_structures/lib.rs b/src/librustc_data_structures/lib.rs
index ee75a3596e1..4623e52ffc2 100644
--- a/src/librustc_data_structures/lib.rs
+++ b/src/librustc_data_structures/lib.rs
@@ -23,7 +23,7 @@
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
       html_favicon_url = "https://www.rust-lang.org/favicon.ico",
       html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(shared)]
 #![feature(collections_range)]
diff --git a/src/librustc_driver/lib.rs b/src/librustc_driver/lib.rs
index ca31022b04c..25049b3d2ba 100644
--- a/src/librustc_driver/lib.rs
+++ b/src/librustc_driver/lib.rs
@@ -21,7 +21,7 @@
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
       html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
       html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(box_syntax)]
 #![feature(libc)]
diff --git a/src/librustc_errors/lib.rs b/src/librustc_errors/lib.rs
index 09a0c7f9be4..bcae7b262c6 100644
--- a/src/librustc_errors/lib.rs
+++ b/src/librustc_errors/lib.rs
@@ -15,7 +15,7 @@
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
       html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
       html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(custom_attribute)]
 #![allow(unused_attributes)]
diff --git a/src/librustc_incremental/lib.rs b/src/librustc_incremental/lib.rs
index d02e4f9b165..ea0a0034c3e 100644
--- a/src/librustc_incremental/lib.rs
+++ b/src/librustc_incremental/lib.rs
@@ -17,7 +17,7 @@
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
       html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
       html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(rustc_private)]
 #![feature(staged_api)]
diff --git a/src/librustc_lint/lib.rs b/src/librustc_lint/lib.rs
index efccc4abd43..60497fe171c 100644
--- a/src/librustc_lint/lib.rs
+++ b/src/librustc_lint/lib.rs
@@ -26,7 +26,7 @@
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
       html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
       html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![cfg_attr(test, feature(test))]
 #![feature(box_patterns)]
diff --git a/src/librustc_llvm/lib.rs b/src/librustc_llvm/lib.rs
index 938f346e0bf..b1615b9e38b 100644
--- a/src/librustc_llvm/lib.rs
+++ b/src/librustc_llvm/lib.rs
@@ -20,7 +20,7 @@
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
        html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
        html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(associated_consts)]
 #![feature(box_syntax)]
diff --git a/src/librustc_metadata/lib.rs b/src/librustc_metadata/lib.rs
index 3986cc507d4..484e0df6583 100644
--- a/src/librustc_metadata/lib.rs
+++ b/src/librustc_metadata/lib.rs
@@ -15,7 +15,7 @@
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
        html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
        html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(box_patterns)]
 #![feature(conservative_impl_trait)]
diff --git a/src/librustc_mir/lib.rs b/src/librustc_mir/lib.rs
index a608275cefa..e7493850aa7 100644
--- a/src/librustc_mir/lib.rs
+++ b/src/librustc_mir/lib.rs
@@ -17,7 +17,7 @@ Rust MIR: a lowered representation of Rust. Also: an experiment!
 #![crate_name = "rustc_mir"]
 #![crate_type = "rlib"]
 #![crate_type = "dylib"]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 #![unstable(feature = "rustc_private", issue = "27812")]
 
 #![feature(associated_consts)]
diff --git a/src/librustc_passes/lib.rs b/src/librustc_passes/lib.rs
index 670ef426c2d..143c1efed5a 100644
--- a/src/librustc_passes/lib.rs
+++ b/src/librustc_passes/lib.rs
@@ -21,7 +21,7 @@
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
        html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
        html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(rustc_diagnostic_macros)]
 #![feature(staged_api)]
diff --git a/src/librustc_platform_intrinsics/lib.rs b/src/librustc_platform_intrinsics/lib.rs
index e814050e960..296c133115f 100644
--- a/src/librustc_platform_intrinsics/lib.rs
+++ b/src/librustc_platform_intrinsics/lib.rs
@@ -13,7 +13,7 @@
 #![crate_type = "dylib"]
 #![crate_type = "rlib"]
 #![feature(staged_api)]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 #![allow(bad_style)]
 
 pub struct Intrinsic {
diff --git a/src/librustc_plugin/lib.rs b/src/librustc_plugin/lib.rs
index 91e0fd636c9..8d4e61ad8e5 100644
--- a/src/librustc_plugin/lib.rs
+++ b/src/librustc_plugin/lib.rs
@@ -57,7 +57,7 @@
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
        html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
        html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(staged_api)]
 #![feature(rustc_diagnostic_macros)]
diff --git a/src/librustc_privacy/lib.rs b/src/librustc_privacy/lib.rs
index 81863a3fadf..84fa2e9d6bb 100644
--- a/src/librustc_privacy/lib.rs
+++ b/src/librustc_privacy/lib.rs
@@ -15,7 +15,7 @@
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
       html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
       html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(rustc_diagnostic_macros)]
 #![feature(rustc_private)]
diff --git a/src/librustc_resolve/lib.rs b/src/librustc_resolve/lib.rs
index 1eeb356480c..39a9194cf5e 100644
--- a/src/librustc_resolve/lib.rs
+++ b/src/librustc_resolve/lib.rs
@@ -15,7 +15,7 @@
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
       html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
       html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(associated_consts)]
 #![feature(rustc_diagnostic_macros)]
diff --git a/src/librustc_save_analysis/lib.rs b/src/librustc_save_analysis/lib.rs
index 43e3b1dd2b5..3f7f3bdba01 100644
--- a/src/librustc_save_analysis/lib.rs
+++ b/src/librustc_save_analysis/lib.rs
@@ -15,7 +15,7 @@
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
       html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
       html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(custom_attribute)]
 #![allow(unused_attributes)]
diff --git a/src/librustc_trans/lib.rs b/src/librustc_trans/lib.rs
index 3a4171e1d0e..d8c0bde963e 100644
--- a/src/librustc_trans/lib.rs
+++ b/src/librustc_trans/lib.rs
@@ -21,7 +21,7 @@
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
       html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
       html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(associated_consts)]
 #![feature(box_patterns)]
diff --git a/src/librustc_typeck/lib.rs b/src/librustc_typeck/lib.rs
index ec17813ed2a..75cd9e2f967 100644
--- a/src/librustc_typeck/lib.rs
+++ b/src/librustc_typeck/lib.rs
@@ -70,7 +70,7 @@ This API is completely unstable and subject to change.
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
       html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
       html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![allow(non_camel_case_types)]
 
diff --git a/src/librustdoc/lib.rs b/src/librustdoc/lib.rs
index 47616044879..c6951d4edd6 100644
--- a/src/librustdoc/lib.rs
+++ b/src/librustdoc/lib.rs
@@ -16,7 +16,7 @@
        html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
        html_root_url = "https://doc.rust-lang.org/nightly/",
        html_playground_url = "https://play.rust-lang.org/")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(box_patterns)]
 #![feature(box_syntax)]
diff --git a/src/libserialize/lib.rs b/src/libserialize/lib.rs
index 0979860189c..cfa09361cce 100644
--- a/src/libserialize/lib.rs
+++ b/src/libserialize/lib.rs
@@ -25,7 +25,7 @@ Core encoding and decoding interfaces.
        html_root_url = "https://doc.rust-lang.org/nightly/",
        html_playground_url = "https://play.rust-lang.org/",
        test(attr(allow(unused_variables), deny(warnings))))]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(box_syntax)]
 #![feature(collections)]
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index f1e3996e825..9557c520c50 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -225,7 +225,7 @@
 
 // Turn warnings into errors, but only after stage0, where it can be useful for
 // code to emit warnings during language transitions
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 // std may use features in a platform-specific way
 #![allow(unused_features)]
diff --git a/src/libstd_unicode/lib.rs b/src/libstd_unicode/lib.rs
index 11724e74cda..d52d1549b51 100644
--- a/src/libstd_unicode/lib.rs
+++ b/src/libstd_unicode/lib.rs
@@ -29,7 +29,7 @@
        html_playground_url = "https://play.rust-lang.org/",
        issue_tracker_base_url = "https://github.com/rust-lang/rust/issues/",
        test(no_crate_inject, attr(allow(unused_variables), deny(warnings))))]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 #![no_std]
 
 #![feature(char_escape_debug)]
diff --git a/src/libsyntax/lib.rs b/src/libsyntax/lib.rs
index 5d6808284f6..00bf7445077 100644
--- a/src/libsyntax/lib.rs
+++ b/src/libsyntax/lib.rs
@@ -22,7 +22,7 @@
        html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
        html_root_url = "https://doc.rust-lang.org/nightly/",
        test(attr(deny(warnings))))]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(associated_consts)]
 #![feature(const_fn)]
diff --git a/src/libsyntax_ext/lib.rs b/src/libsyntax_ext/lib.rs
index cbc2b2263f2..bdec86158a4 100644
--- a/src/libsyntax_ext/lib.rs
+++ b/src/libsyntax_ext/lib.rs
@@ -17,7 +17,7 @@
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
        html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
        html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(proc_macro_internals)]
 #![feature(rustc_private)]
diff --git a/src/libsyntax_pos/lib.rs b/src/libsyntax_pos/lib.rs
index 44067b3132c..92fdb45caaa 100644
--- a/src/libsyntax_pos/lib.rs
+++ b/src/libsyntax_pos/lib.rs
@@ -21,7 +21,7 @@
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
       html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
       html_root_url = "https://doc.rust-lang.org/nightly/")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(custom_attribute)]
 #![allow(unused_attributes)]
diff --git a/src/libterm/lib.rs b/src/libterm/lib.rs
index 01daa938142..370757c0609 100644
--- a/src/libterm/lib.rs
+++ b/src/libterm/lib.rs
@@ -52,7 +52,7 @@
        html_playground_url = "https://play.rust-lang.org/",
        test(attr(deny(warnings))))]
 #![deny(missing_docs)]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(box_syntax)]
 #![feature(staged_api)]
diff --git a/src/libtest/lib.rs b/src/libtest/lib.rs
index 82acbf93488..30c34746c34 100644
--- a/src/libtest/lib.rs
+++ b/src/libtest/lib.rs
@@ -31,7 +31,7 @@
        html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
        html_root_url = "https://doc.rust-lang.org/nightly/",
        test(attr(deny(warnings))))]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(asm)]
 #![feature(libc)]
diff --git a/src/libunwind/lib.rs b/src/libunwind/lib.rs
index add45ccb362..7fa2ce650fd 100644
--- a/src/libunwind/lib.rs
+++ b/src/libunwind/lib.rs
@@ -12,7 +12,7 @@
 #![crate_name = "unwind"]
 #![crate_type = "rlib"]
 #![unstable(feature = "panic_unwind", issue = "32837")]
-#![cfg_attr(not(stage0), deny(warnings))]
+#![deny(warnings)]
 
 #![feature(cfg_target_vendor)]
 #![feature(staged_api)]