Auto merge of #62910 - petrochenkov:buildwarn2, r=Mark-Simulacrum

cleanup: Remove lint annotations in specific crates that are already enforced by rustbuild

Remove some random unnecessary lint `allow`s.

Deny `unused_lifetimes` through rustbuild.

r? @Mark-Simulacrum

Author: bors

src/bootstrap/bin/main.rs

@@ -5,7 +5,8 @@
 //! parent directory, and otherwise documentation can be found throughout the `build`
 //! directory in each respective module.
 
-#![deny(warnings)]
+// NO-RUSTC-WRAPPER
+#![deny(warnings, rust_2018_idioms, unused_lifetimes)]
 
 use std::env;
 

src/bootstrap/bin/rustc.rs

@@ -15,7 +15,8 @@
 //! switching compilers for the bootstrap and for build scripts will probably
 //! never get replaced.
 
-#![deny(warnings)]
+// NO-RUSTC-WRAPPER
+#![deny(warnings, rust_2018_idioms, unused_lifetimes)]
 
 use std::env;
 use std::ffi::OsString;
@@ -126,8 +127,11 @@ fn main() {
 
     if env::var_os("RUSTC_DENY_WARNINGS").is_some() &&
        env::var_os("RUSTC_EXTERNAL_TOOL").is_none() {
+        // When extending this list, search for `NO-RUSTC-WRAPPER` and add the new lints
+        // there as well, some code doesn't go through this `rustc` wrapper.
         cmd.arg("-Dwarnings");
         cmd.arg("-Drust_2018_idioms");
+        cmd.arg("-Dunused_lifetimes");
         // cfg(not(bootstrap)): Remove this during the next stage 0 compiler update.
         // `-Drustc::internal` is a new feature and `rustc_version` mis-reports the `stage`.
         let cfg_not_bootstrap = stage != "0" && crate_name != Some("rustc_version");

src/bootstrap/bin/rustdoc.rs

@@ -2,7 +2,8 @@
 //!
 //! See comments in `src/bootstrap/rustc.rs` for more information.
 
-#![deny(warnings)]
+// NO-RUSTC-WRAPPER
+#![deny(warnings, rust_2018_idioms, unused_lifetimes)]
 
 use std::env;
 use std::process::Command;

src/bootstrap/lib.rs

@@ -103,8 +103,9 @@
 //! More documentation can be found in each respective module below, and you can
 //! also check out the `src/bootstrap/README.md` file for more information.
 
-#![deny(rust_2018_idioms)]
-#![deny(warnings)]
+// NO-RUSTC-WRAPPER
+#![deny(warnings, rust_2018_idioms, unused_lifetimes)]
+
 #![feature(core_intrinsics)]
 #![feature(drain_filter)]
 
@@ -1312,7 +1313,7 @@ fn chmod(path: &Path, perms: u32) {
 fn chmod(_path: &Path, _perms: u32) {}
 
 
-impl<'a> Compiler {
+impl Compiler {
     pub fn with_stage(mut self, stage: u32) -> Compiler {
         self.stage = stage;
         self

src/build_helper/lib.rs

@@ -1,4 +1,5 @@
-#![deny(rust_2018_idioms)]
+// NO-RUSTC-WRAPPER
+#![deny(warnings, rust_2018_idioms, unused_lifetimes)]
 
 use std::fs::File;
 use std::path::{Path, PathBuf};

src/liballoc/lib.rs

@@ -62,8 +62,6 @@
 #![warn(missing_docs)]
 #![warn(missing_debug_implementations)]
 #![deny(intra_doc_link_resolution_failure)] // rustdoc is run without -D warnings
-
-#![deny(rust_2018_idioms)]
 #![allow(explicit_outlives_requirements)]
 
 #![cfg_attr(not(test), feature(generator_trait))]

src/liballoc/string.rs

@@ -1838,6 +1838,7 @@ impl PartialEq for String {
 macro_rules! impl_eq {
     ($lhs:ty, $rhs: ty) => {
         #[stable(feature = "rust1", since = "1.0.0")]
+        #[allow(unused_lifetimes)]
         impl<'a, 'b> PartialEq<$rhs> for $lhs {
             #[inline]
             fn eq(&self, other: &$rhs) -> bool { PartialEq::eq(&self[..], &other[..]) }
@@ -1846,6 +1847,7 @@ macro_rules! impl_eq {
         }
 
         #[stable(feature = "rust1", since = "1.0.0")]
+        #[allow(unused_lifetimes)]
         impl<'a, 'b> PartialEq<$lhs> for $rhs {
             #[inline]
             fn eq(&self, other: &$lhs) -> bool { PartialEq::eq(&self[..], &other[..]) }

src/liballoc/tests/lib.rs

@@ -8,7 +8,6 @@
 #![feature(trusted_len)]
 #![feature(try_reserve)]
 #![feature(unboxed_closures)]
-#![deny(rust_2018_idioms)]
 
 use std::hash::{Hash, Hasher};
 use std::collections::hash_map::DefaultHasher;

src/libarena/lib.rs

@@ -11,9 +11,6 @@
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/",
        test(no_crate_inject, attr(deny(warnings))))]
 
-#![deny(rust_2018_idioms)]
-#![deny(unused_lifetimes)]
-
 #![feature(core_intrinsics)]
 #![feature(dropck_eyepatch)]
 #![feature(raw_vec_internals)]

src/libcore/array.rs

@@ -217,7 +217,7 @@ where
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl<'a, 'b, A, B, const N: usize> PartialEq<[B; N]> for [A; N]
+impl<A, B, const N: usize> PartialEq<[B; N]> for [A; N]
 where
     A: PartialEq<B>,
     [A; N]: LengthAtMost32,
@@ -234,7 +234,7 @@ where
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl<'a, 'b, A, B, const N: usize> PartialEq<[B]> for [A; N]
+impl<A, B, const N: usize> PartialEq<[B]> for [A; N]
 where
     A: PartialEq<B>,
     [A; N]: LengthAtMost32,
@@ -250,7 +250,7 @@ where
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl<'a, 'b, A, B, const N: usize> PartialEq<[A; N]> for [B]
+impl<A, B, const N: usize> PartialEq<[A; N]> for [B]
 where
     B: PartialEq<A>,
     [A; N]: LengthAtMost32,
@@ -266,7 +266,7 @@ where
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl<'a, 'b, A, B, const N: usize> PartialEq<&'b [B]> for [A; N]
+impl<'b, A, B, const N: usize> PartialEq<&'b [B]> for [A; N]
 where
     A: PartialEq<B>,
     [A; N]: LengthAtMost32,
@@ -282,7 +282,7 @@ where
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl<'a, 'b, A, B, const N: usize> PartialEq<[A; N]> for &'b [B]
+impl<'b, A, B, const N: usize> PartialEq<[A; N]> for &'b [B]
 where
     B: PartialEq<A>,
     [A; N]: LengthAtMost32,
@@ -298,7 +298,7 @@ where
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl<'a, 'b, A, B, const N: usize> PartialEq<&'b mut [B]> for [A; N]
+impl<'b, A, B, const N: usize> PartialEq<&'b mut [B]> for [A; N]
 where
     A: PartialEq<B>,
     [A; N]: LengthAtMost32,
@@ -314,7 +314,7 @@ where
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl<'a, 'b, A, B, const N: usize> PartialEq<[A; N]> for &'b mut [B]
+impl<'b, A, B, const N: usize> PartialEq<[A; N]> for &'b mut [B]
 where
     B: PartialEq<A>,
     [A; N]: LengthAtMost32,