refactor(multiple): Clippy run

src/header/common/accept_ranges.rs

@@ -95,7 +95,7 @@ impl Display for RangeUnit {
         match *self {
             RangeUnit::Bytes => f.write_str("bytes"),
             RangeUnit::None => f.write_str("none"),
-            RangeUnit::Unregistered(ref x) => f.write_str(&x),
+            RangeUnit::Unregistered(ref x) => f.write_str(x),
         }
     }
 }

src/header/common/content_range.rs

@@ -182,7 +182,7 @@ impl Display for ContentRangeSpec {
             ContentRangeSpec::Unregistered { ref unit, ref resp } => {
                 try!(f.write_str(&unit));
                 try!(f.write_str(" "));
-                f.write_str(&resp)
+                f.write_str(resp)
             }
         }
     }

src/header/common/host.rs

@@ -69,14 +69,10 @@ impl Header for Host {
                 }
             };
 
-            let port = match idx {
-                Some(idx) => s[idx + 1..].parse().ok(),
-                None => None
-            };
+            let port = idx.and_then(|idx| s[idx + 1..].parse().ok());
 
-            match idx {
-                Some(idx) => s.truncate(idx),
-                None => ()
+            if let Some(idx) = idx {
+                s.truncate(idx)
             }
 
             Ok(Host {

src/header/common/prefer.rs

@@ -106,7 +106,7 @@ impl fmt::Display for Preference {
             Extension(ref name, ref value, ref params) => {
                 try!(write!(f, "{}", name));
                 if value != "" { try!(write!(f, "={}", value)); }
-                if params.len() > 0 {
+                if !params.is_empty() {
                     for &(ref name, ref value) in params {
                         try!(write!(f, "; {}", name));
                         if value != "" { try!(write!(f, "={}", value)); }
@@ -138,12 +138,12 @@ impl FromStr for Preference {
             Some(param) => {
                 let rest: Vec<(String, String)> = params.map(|(l, r)| (l.to_owned(), r.to_owned())).collect();
                 match param {
-                    ("respond-async", "") => if rest.len() == 0 { Ok(RespondAsync) } else { Err(None) },
-                    ("return", "representation") => if rest.len() == 0 { Ok(ReturnRepresentation) } else { Err(None) },
-                    ("return", "minimal") => if rest.len() == 0 { Ok(ReturnMinimal) } else { Err(None) },
-                    ("handling", "strict") => if rest.len() == 0 { Ok(HandlingStrict) } else { Err(None) },
-                    ("handling", "leniant") => if rest.len() == 0 { Ok(HandlingLeniant) } else { Err(None) },
-                    ("wait", secs) => if rest.len() == 0 { secs.parse().map(Wait).map_err(Some) } else { Err(None) },
+                    ("respond-async", "") => if rest.is_empty() { Ok(RespondAsync) } else { Err(None) },
+                    ("return", "representation") => if rest.is_empty() { Ok(ReturnRepresentation) } else { Err(None) },
+                    ("return", "minimal") => if rest.is_empty() { Ok(ReturnMinimal) } else { Err(None) },
+                    ("handling", "strict") => if rest.is_empty() { Ok(HandlingStrict) } else { Err(None) },
+                    ("handling", "leniant") => if rest.is_empty() { Ok(HandlingLeniant) } else { Err(None) },
+                    ("wait", secs) => if rest.is_empty() { secs.parse().map(Wait).map_err(Some) } else { Err(None) },
                     (left, right) => Ok(Extension(left.to_owned(), right.to_owned(), rest))
                 }
             },

src/header/common/preference_applied.rs

@@ -71,7 +71,7 @@ impl Header for PreferenceApplied {
               value.to_owned(),
               vec![]
             ),
-            preference @ _ => preference.clone()
+            preference => preference.clone()
         }).collect();
         fmt_comma_delimited(f, &preferences)
     }

src/header/common/range.rs

@@ -126,7 +126,7 @@ impl FromStr for Range {
     type Err = ::Error;
 
     fn from_str(s: &str) -> ::Result<Range> {
-        let mut iter = s.splitn(2, "=");
+        let mut iter = s.splitn(2, '=');
 
         match (iter.next(), iter.next()) {
             (Some("bytes"), Some(ranges)) => {
@@ -153,7 +153,7 @@ impl FromStr for ByteRangeSpec {
     type Err = ::Error;
 
     fn from_str(s: &str) -> ::Result<ByteRangeSpec> {
-        let mut parts = s.splitn(2, "-");
+        let mut parts = s.splitn(2, '-');
 
         match (parts.next(), parts.next()) {
             (Some(""), Some(end)) => {