Rollup merge of #76287 - lzutao:rm-allowed, r=jyn514

Remove an unnecessary allowed lint It is outdated.
rust-lang · Sep 6, 2020 · 7ad2b3a · 7ad2b3a
2 parents 6545985 + a3ee65f
commit 7ad2b3a
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diff --git a/library/core/src/slice/mod.rs b/library/core/src/slice/mod.rs
@@ -66,7 +66,6 @@ impl<T> [T] {
     #[rustc_const_stable(feature = "const_slice_len", since = "1.32.0")]
     #[inline]
     // SAFETY: const sound because we transmute out the length field as a usize (which it must be)
-    #[allow(unused_attributes)]
     #[allow_internal_unstable(const_fn_union)]
     pub const fn len(&self) -> usize {
         // SAFETY: this is safe because `&[T]` and `FatPtr<T>` have the same layout.

diff --git a/library/std/src/os/raw/mod.rs b/library/std/src/os/raw/mod.rs
@@ -9,7 +9,6 @@
 #![stable(feature = "raw_os", since = "1.1.0")]
 
 #[cfg(test)]
-#[allow(unused_imports)]
 mod tests;
 
 #[doc(include = "char.md")]

diff --git a/library/std/src/os/raw/tests.rs b/library/std/src/os/raw/tests.rs
@@ -1,5 +1,4 @@
 use crate::any::TypeId;
-use crate::mem;
 
 macro_rules! ok {
     ($($t:ident)*) => {$(