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 21e45f9c4b2..e4a7dc0760d 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 4daa6cbb846..5b1dede9f15 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 6044bec2c5a..60add8eef42 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 68b067012d3..61df05c260f 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 9834fca5fdc..a3d32572bf1 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 5ee9fecfb21..eb3b94407d1 100644
--- a/src/libproc_macro/lib.rs
+++ b/src/libproc_macro/lib.rs
@@ -30,7 +30,7 @@
 #![unstable(feature = "proc_macro_lib", issue = "27812")]
 #![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 ff508d2d819..11eb70adf16 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 86f244d65dd..99482ee329a 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(nonzero)]
 #![feature(rustc_private)]
diff --git a/src/librustc_driver/lib.rs b/src/librustc_driver/lib.rs
index f84622c2f02..6e7588611db 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 ce73b14ef2d..489076efd88 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 a53d43b2a25..ba9775924f6 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 69709f72b8b..dc45b2ad4d4 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 56f3cfc12c9..0efc768926f 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 617bd81d96a..9c8685f3d6b 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 6fe1f0c2b9c..8b7d27d1ffd 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 865195d3db4..63f250377c0 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 3a8eef131a2..8804fa64dd5 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 ad2304e1556..dcef60896f8 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 fc5c6968544..2091d918f60 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 b3b0ee6093d..27f91b025e3 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 e31b29d5cc1..d14d4cecaae 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_lib)]
 #![feature(proc_macro_internals)]
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)]