2 files changed, 6 insertions, 7 deletions
diff --git a/src/libsyntax/parse/lexer/comments.rs b/src/libsyntax/parse/lexer/comments.rs
index b17fc7fe82e..c0823e04288 100644
--- a/src/libsyntax/parse/lexer/comments.rs
+++ b/src/libsyntax/parse/lexer/comments.rs
@@ -61,7 +61,7 @@ pub fn doc_comment_style(comment: &str) -> ast::AttrStyle {
 
 pub fn strip_doc_comment_decoration(comment: &str) -> String {
     /// remove whitespace-only lines from the start/end of lines
-    fn vertical_trim(lines: Vec<String> ) -> Vec<String> {
+    fn vertical_trim(lines: Vec<String>) -> Vec<String> {
         let mut i = 0;
         let mut j = lines.len();
         // first line of all-stars should be omitted
@@ -82,7 +82,7 @@ pub fn strip_doc_comment_decoration(comment: &str) -> String {
         while j > i && lines[j - 1].trim().is_empty() {
             j -= 1;
         }
-        return lines[i..j].iter().map(|x| (*x).clone()).collect();
+        lines[i..j].iter().cloned().collect()
     }
 
     /// remove a "[ \t]*\*" block from each line, if possible
diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index 407740e580d..f14cd524776 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -240,9 +240,8 @@ macro_rules! maybe_whole {
 
 fn maybe_append(mut lhs: Vec<Attribute>, rhs: Option<Vec<Attribute>>)
                 -> Vec<Attribute> {
-    match rhs {
-        Some(ref attrs) => lhs.extend(attrs.iter().map(|a| a.clone())),
-        None => {}
+    if let Some(ref attrs) = rhs {
+        lhs.extend(attrs.iter().cloned())
     }
     lhs
 }
@@ -467,7 +466,7 @@ impl<'a> Parser<'a> {
         debug!("commit_expr {:?}", e);
         if let ExprPath(..) = e.node {
             // might be unit-struct construction; check for recoverableinput error.
-            let mut expected = edible.iter().map(|x| x.clone()).collect::<Vec<_>>();
+            let mut expected = edible.iter().cloned().collect::<Vec<_>>();
             expected.push_all(inedible);
             self.check_for_erroneous_unit_struct_expecting(&expected[]);
         }
@@ -485,7 +484,7 @@ impl<'a> Parser<'a> {
         if self.last_token
                .as_ref()
                .map_or(false, |t| t.is_ident() || t.is_path()) {
-            let mut expected = edible.iter().map(|x| x.clone()).collect::<Vec<_>>();
+            let mut expected = edible.iter().cloned().collect::<Vec<_>>();
             expected.push_all(&inedible[]);
             self.check_for_erroneous_unit_struct_expecting(
                 &expected[]);