3 files changed, 2 insertions, 3 deletions
diff --git a/src/liballoc/lib.rs b/src/liballoc/lib.rs
index e42d6434725..c0f345443b9 100644
--- a/src/liballoc/lib.rs
+++ b/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))]
diff --git a/src/liballoc/string.rs b/src/liballoc/string.rs
index 366191e2c85..eca726cd410 100644
--- a/src/liballoc/string.rs
+++ b/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[..]) }
diff --git a/src/liballoc/tests/lib.rs b/src/liballoc/tests/lib.rs
index 5a43c8e09a2..6d774f3fecd 100644
--- a/src/liballoc/tests/lib.rs
+++ b/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;