Remove needless lifetimes (std)

src/liballoc/collections/btree/map.rs

@@ -2004,7 +2004,7 @@ impl<K, V> BTreeMap<K, V> {
     /// assert_eq!(keys, [1, 2]);
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
-    pub fn keys<'a>(&'a self) -> Keys<'a, K, V> {
+    pub fn keys(&self) -> Keys<'_, K, V> {
         Keys { inner: self.iter() }
     }
 
@@ -2025,7 +2025,7 @@ impl<K, V> BTreeMap<K, V> {
     /// assert_eq!(values, ["hello", "goodbye"]);
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
-    pub fn values<'a>(&'a self) -> Values<'a, K, V> {
+    pub fn values(&self) -> Values<'_, K, V> {
         Values { inner: self.iter() }
     }
 
@@ -2529,8 +2529,8 @@ enum UnderflowResult<'a, K, V> {
     Stole(NodeRef<marker::Mut<'a>, K, V, marker::Internal>),
 }
 
-fn handle_underfull_node<'a, K, V>(node: NodeRef<marker::Mut<'a>, K, V, marker::LeafOrInternal>)
-                                   -> UnderflowResult<'a, K, V> {
+fn handle_underfull_node<K, V>(node: NodeRef<marker::Mut<'_>, K, V, marker::LeafOrInternal>)
+                               -> UnderflowResult<'_, K, V> {
     let parent = if let Ok(parent) = node.ascend() {
         parent
     } else {

src/liballoc/collections/btree/node.rs

@@ -394,7 +394,7 @@ impl<BorrowType, K, V, Type> NodeRef<BorrowType, K, V, Type> {
     }
 
     /// Temporarily takes out another, immutable reference to the same node.
-    fn reborrow<'a>(&'a self) -> NodeRef<marker::Immut<'a>, K, V, Type> {
+    fn reborrow(&self) -> NodeRef<marker::Immut<'_>, K, V, Type> {
         NodeRef {
             height: self.height,
             node: self.node,

src/liballoc/string.rs

@@ -552,7 +552,7 @@ impl String {
     /// assert_eq!("Hello �World", output);
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
-    pub fn from_utf8_lossy<'a>(v: &'a [u8]) -> Cow<'a, str> {
+    pub fn from_utf8_lossy(v: &[u8]) -> Cow<'_, str> {
         let mut iter = lossy::Utf8Lossy::from_bytes(v).chunks();
 
         let (first_valid, first_broken) = if let Some(chunk) = iter.next() {

src/libcore/marker.rs

@@ -498,7 +498,7 @@ macro_rules! impls{
 /// #     end: *const T,
 /// #     phantom: PhantomData<&'a T>,
 /// # }
-/// fn borrow_vec<'a, T>(vec: &'a Vec<T>) -> Slice<'a, T> {
+/// fn borrow_vec<T>(vec: &Vec<T>) -> Slice<'_, T> {
 ///     let ptr = vec.as_ptr();
 ///     Slice {
 ///         start: ptr,

src/libcore/ops/index.rs

@@ -105,7 +105,7 @@ pub trait Index<Idx: ?Sized> {
 /// impl Index<Side> for Balance {
 ///     type Output = Weight;
 ///
-///     fn index<'a>(&'a self, index: Side) -> &'a Self::Output {
+///     fn index(&self, index: Side) -> &Self::Output {
 ///         println!("Accessing {:?}-side of balance immutably", index);
 ///         match index {
 ///             Side::Left => &self.left,
@@ -115,7 +115,7 @@ pub trait Index<Idx: ?Sized> {
 /// }
 ///
 /// impl IndexMut<Side> for Balance {
-///     fn index_mut<'a>(&'a mut self, index: Side) -> &'a mut Self::Output {
+///     fn index_mut(&mut self, index: Side) -> &mut Self::Output {
 ///         println!("Accessing {:?}-side of balance mutably", index);
 ///         match index {
 ///             Side::Left => &mut self.left,

src/librustdoc/clean/mod.rs

@@ -392,7 +392,7 @@ impl fmt::Debug for Item {
 impl Item {
     /// Finds the `doc` attribute as a NameValue and returns the corresponding
     /// value found.
-    pub fn doc_value<'a>(&'a self) -> Option<&'a str> {
+    pub fn doc_value(&self) -> Option<&str> {
         self.attrs.doc_value()
     }
     /// Finds all `doc` attributes as NameValues and returns their corresponding values, joined
@@ -699,11 +699,11 @@ impl<'a> Iterator for ListAttributesIter<'a> {
 
 pub trait AttributesExt {
     /// Finds an attribute as List and returns the list of attributes nested inside.
-    fn lists<'a>(&'a self, name: Symbol) -> ListAttributesIter<'a>;
+    fn lists(&self, name: Symbol) -> ListAttributesIter<'_>;
 }
 
 impl AttributesExt for [ast::Attribute] {
-    fn lists<'a>(&'a self, name: Symbol) -> ListAttributesIter<'a> {
+    fn lists(&self, name: Symbol) -> ListAttributesIter<'_> {
         ListAttributesIter {
             attrs: self.iter(),
             current_list: Vec::new().into_iter(),
@@ -952,7 +952,7 @@ impl Attributes {
 
     /// Finds the `doc` attribute as a NameValue and returns the corresponding
     /// value found.
-    pub fn doc_value<'a>(&'a self) -> Option<&'a str> {
+    pub fn doc_value(&self) -> Option<&str> {
         self.doc_strings.first().map(|s| s.as_str())
     }
 
@@ -1037,7 +1037,7 @@ impl Hash for Attributes {
 }
 
 impl AttributesExt for Attributes {
-    fn lists<'a>(&'a self, name: Symbol) -> ListAttributesIter<'a> {
+    fn lists(&self, name: Symbol) -> ListAttributesIter<'_> {
         self.other_attrs.lists(name)
     }
 }

src/librustdoc/html/render.rs

@@ -2541,7 +2541,7 @@ fn full_path(cx: &Context, item: &clean::Item) -> String {
     s
 }
 
-fn shorter<'a>(s: Option<&'a str>) -> String {
+fn shorter(s: Option<&str>) -> String {
     match s {
         Some(s) => s.lines()
             .skip_while(|s| s.chars().all(|c| c.is_whitespace()))

src/librustdoc/html/toc.rs

@@ -119,7 +119,7 @@ impl TocBuilder {
     /// Push a level `level` heading into the appropriate place in the
     /// hierarchy, returning a string containing the section number in
     /// `<num>.<num>.<num>` format.
-    pub fn push<'a>(&'a mut self, level: u32, name: String, id: String) -> &'a str {
+    pub fn push(&mut self, level: u32, name: String, id: String) -> &str {
         assert!(level >= 1);
 
         // collapse all previous sections into their parents until we

src/librustdoc/markdown.rs

@@ -17,7 +17,7 @@ use crate::html::markdown::{ErrorCodes, IdMap, Markdown, MarkdownWithToc, find_t
 use crate::test::{TestOptions, Collector};
 
 /// Separate any lines at the start of the file that begin with `# ` or `%`.
-fn extract_leading_metadata<'a>(s: &'a str) -> (Vec<&'a str>, &'a str) {
+fn extract_leading_metadata(s: &str) -> (Vec<&str>, &str) {
     let mut metadata = Vec::new();
     let mut count = 0;
 

src/libserialize/json.rs

@@ -1031,7 +1031,7 @@ impl Json {
 
      /// If the Json value is an Object, returns the value associated with the provided key.
     /// Otherwise, returns None.
-    pub fn find<'a>(&'a self, key: &str) -> Option<&'a Json>{
+    pub fn find(&self, key: &str) -> Option<&Json> {
         match *self {
             Json::Object(ref map) => map.get(key),
             _ => None
@@ -1052,7 +1052,7 @@ impl Json {
     /// If the Json value is an Object, performs a depth-first search until
     /// a value associated with the provided key is found. If no value is found
     /// or the Json value is not an Object, returns `None`.
-    pub fn search<'a>(&'a self, key: &str) -> Option<&'a Json> {
+    pub fn search(&self, key: &str) -> Option<&Json> {
         match self {
             &Json::Object(ref map) => {
                 match map.get(key) {

src/libstd/sync/mpsc/sync.rs

@@ -140,7 +140,7 @@ fn wait_timeout_receiver<'a, 'b, T>(lock: &'a Mutex<State<T>>,
     new_guard
 }
 
-fn abort_selection<'a, T>(guard: &mut MutexGuard<'a , State<T>>) -> bool {
+fn abort_selection<T>(guard: &mut MutexGuard<'_, State<T>>) -> bool {
     match mem::replace(&mut guard.blocker, NoneBlocked) {
         NoneBlocked => true,
         BlockedSender(token) => {

src/libstd/sys/redox/ext/net.rs

@@ -673,7 +673,7 @@ impl UnixListener {
     /// }
     /// ```
     #[stable(feature = "unix_socket_redox", since = "1.29.0")]
-    pub fn incoming<'a>(&'a self) -> Incoming<'a> {
+    pub fn incoming(&self) -> Incoming<'_> {
         Incoming { listener: self }
     }
 }

src/libstd/sys/unix/ext/net.rs

@@ -198,7 +198,7 @@ impl SocketAddr {
         }
     }
 
-    fn address<'a>(&'a self) -> AddressKind<'a> {
+    fn address(&self) -> AddressKind<'_> {
         let len = self.len as usize - sun_path_offset(&self.addr);
         let path = unsafe { mem::transmute::<&[libc::c_char], &[u8]>(&self.addr.sun_path) };
 
@@ -894,7 +894,7 @@ impl UnixListener {
     /// }
     /// ```
     #[stable(feature = "unix_socket", since = "1.10.0")]
-    pub fn incoming<'a>(&'a self) -> Incoming<'a> {
+    pub fn incoming(&self) -> Incoming<'_> {
         Incoming { listener: self }
     }
 }

src/libstd/sys/windows/mod.rs

@@ -195,7 +195,7 @@ fn wide_char_to_multi_byte(code_page: u32,
     }
 }
 
-pub fn truncate_utf16_at_nul<'a>(v: &'a [u16]) -> &'a [u16] {
+pub fn truncate_utf16_at_nul(v: &[u16]) -> &[u16] {
     match v.iter().position(|c| *c == 0) {
         // don't include the 0
         Some(i) => &v[..i],

src/libstd/sys/windows/path.rs

@@ -19,7 +19,7 @@ pub fn is_verbatim_sep(b: u8) -> bool {
     b == b'\\'
 }
 
-pub fn parse_prefix<'a>(path: &'a OsStr) -> Option<Prefix<'a>> {
+pub fn parse_prefix(path: &OsStr) -> Option<Prefix<'_>> {
     use crate::path::Prefix::*;
     unsafe {
         // The unsafety here stems from converting between &OsStr and &[u8]

src/libstd/sys_common/io.rs

@@ -16,7 +16,7 @@ pub mod test {
             p.join(path)
         }
 
-        pub fn path<'a>(&'a self) -> &'a Path {
+        pub fn path(&self) -> &Path {
             let TempDir(ref p) = *self;
             p
         }