Some clippy changes

src/comment.rs

@@ -525,7 +525,7 @@ fn rewrite_comment_inner(
 
 const RUSTFMT_CUSTOM_COMMENT_PREFIX: &str = "//#### ";
 
-fn hide_sharp_behind_comment<'a>(s: &'a str) -> Cow<'a, str> {
+fn hide_sharp_behind_comment(s: &str) -> Cow<str> {
     if s.trim_left().starts_with("# ") {
         Cow::from(format!("{}{}", RUSTFMT_CUSTOM_COMMENT_PREFIX, s))
     } else {
@@ -823,20 +823,20 @@ pub enum FullCodeCharKind {
 }
 
 impl FullCodeCharKind {
-    pub fn is_comment(&self) -> bool {
-        match *self {
+    pub fn is_comment(self) -> bool {
+        match self {
             FullCodeCharKind::StartComment
             | FullCodeCharKind::InComment
             | FullCodeCharKind::EndComment => true,
             _ => false,
         }
     }
 
-    pub fn is_string(&self) -> bool {
-        *self == FullCodeCharKind::InString
+    pub fn is_string(self) -> bool {
+        self == FullCodeCharKind::InString
     }
 
-    fn to_codecharkind(&self) -> CodeCharKind {
+    fn to_codecharkind(self) -> CodeCharKind {
         if self.is_comment() {
             CodeCharKind::Comment
         } else {
@@ -987,9 +987,7 @@ impl<'a> Iterator for LineClasses<'a> {
     type Item = (FullCodeCharKind, String);
 
     fn next(&mut self) -> Option<Self::Item> {
-        if self.base.peek().is_none() {
-            return None;
-        }
+        self.base.peek()?;
 
         let mut line = String::new();
 
@@ -1174,7 +1172,7 @@ pub fn filter_normal_code(code: &str) -> String {
         }
         _ => (),
     });
-    if !code.ends_with("\n") && buffer.ends_with("\n") {
+    if !code.ends_with('\n') && buffer.ends_with('\n') {
         buffer.pop();
     }
     buffer

src/config/config_type.rs

@@ -175,11 +175,11 @@ macro_rules! create_config {
             }
             )+
 
-            pub fn set<'a>(&'a mut self) -> ConfigSetter<'a> {
+            pub fn set(&mut self) -> ConfigSetter {
                 ConfigSetter(self)
             }
 
-            pub fn was_set<'a>(&'a self) -> ConfigWasSet<'a> {
+            pub fn was_set(&self) -> ConfigWasSet {
                 ConfigWasSet(self)
             }
 

src/config/lists.rs

@@ -80,12 +80,12 @@ pub enum SeparatorPlace {
 impl_enum_serialize_and_deserialize!(SeparatorPlace, Front, Back);
 
 impl SeparatorPlace {
-    pub fn is_front(&self) -> bool {
-        *self == SeparatorPlace::Front
+    pub fn is_front(self) -> bool {
+        self == SeparatorPlace::Front
     }
 
-    pub fn is_back(&self) -> bool {
-        *self == SeparatorPlace::Back
+    pub fn is_back(self) -> bool {
+        self == SeparatorPlace::Back
     }
 
     pub fn from_tactic(

src/lists.rs

@@ -209,8 +209,8 @@ pub enum Separator {
 }
 
 impl Separator {
-    pub fn len(&self) -> usize {
-        match *self {
+    pub fn len(self) -> usize {
+        match self {
             // 2 = `, `
             Separator::Comma => 2,
             // 3 = ` | `

src/matches.rs

@@ -289,7 +289,7 @@ fn rewrite_match_pattern(
         guard,
         shape,
         trimmed_last_line_width(&pats_str),
-        pats_str.contains("\n"),
+        pats_str.contains('\n'),
     )?;
 
     Some(format!("{}{}", pats_str, guard_str))

src/overflow.rs

@@ -223,7 +223,7 @@ impl<'a, T: 'a + Rewrite + ToExpr + Spanned> Context<'a, T> {
         // 1 = "("
         let combine_arg_with_callee = self.items.len() == 1
             && self.items[0].to_expr().is_some()
-            && self.ident.len() + 1 <= self.context.config.tab_spaces();
+            && self.ident.len() < self.context.config.tab_spaces();
         let overflow_last = combine_arg_with_callee || can_be_overflowed(self.context, self.items);
 
         // Replace the last item with its first line to see if it fits with

src/types.rs

@@ -520,7 +520,7 @@ impl Rewrite for ast::GenericBounds {
         }
 
         let span = mk_sp(self.get(0)?.span().lo(), self.last()?.span().hi());
-        let has_paren = context.snippet(span).starts_with("(");
+        let has_paren = context.snippet(span).starts_with('(');
         let bounds_shape = if has_paren {
             shape.offset_left(1)?.sub_width(1)?
         } else {