Fix 2018 edition fallout.

Author: kennytm

library/core/src/needle/ext.rs

@@ -5,9 +5,9 @@ use super::needle::{
     Needle, Searcher, ReverseSearcher, DoubleEndedSearcher,
     Consumer, ReverseConsumer, DoubleEndedConsumer,
 };
-use iter::FusedIterator;
-use ops::Range;
-use fmt;
+use crate::iter::FusedIterator;
+use crate::ops::Range;
+use crate::fmt;
 
 macro_rules! generate_clone_and_debug {
     ($name:ident, $field:tt) => {
@@ -31,7 +31,7 @@ macro_rules! generate_clone_and_debug {
             S: fmt::Debug,
             H::Target: Hay, // FIXME: RFC 2089 or 2289
         {
-            fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+            fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
                 f.debug_tuple(stringify!($name))
                     .field(&self.$field)
                     .finish()

library/core/src/needle/haystack.rs

@@ -1,5 +1,5 @@
-use fmt::Debug;
-use ops::{Deref, Range};
+use crate::fmt::Debug;
+use crate::ops::{Deref, Range};
 
 /// Borrowed `Haystack`.
 ///
@@ -271,7 +271,7 @@ where H::Target: Hay // FIXME: RFC 2089 or 2289
 {
     #[inline]
     default fn take(&mut self) -> Self {
-        ::mem::replace(self, Self::empty())
+        crate::mem::replace(self, Self::empty())
     }
 
     #[inline]

library/core/src/needle/needle.rs

@@ -1,6 +1,6 @@
 use super::haystack::{Haystack, Hay, Span};
 
-use ops::Range;
+use crate::ops::Range;
 
 /// A searcher, for searching a [`Needle`] from a [`Hay`].
 ///