Use deref coercion to simplify some argument passing

src/input.rs

@@ -50,7 +50,7 @@ impl InputDescription {
     }
 
     pub fn title(&self) -> &String {
-        match self.title.as_ref() {
+        match &self.title {
             Some(title) => title,
             None => &self.name,
         }

src/printer.rs

@@ -395,7 +395,7 @@ impl<'a> Printer for InteractivePrinter<'a> {
                     return Ok(());
                 }
             };
-            highlighter.highlight(line.as_ref(), self.syntax_set)
+            highlighter.highlight(&line, self.syntax_set)
         };
 
         if out_of_range {

src/syntax_mapping.rs

@@ -151,7 +151,7 @@ impl<'a> SyntaxMapping<'a> {
     }
 
     pub(crate) fn get_syntax_for(&self, path: impl AsRef<Path>) -> Option<MappingTarget<'a>> {
-        let candidate = Candidate::new(path.as_ref());
+        let candidate = Candidate::new(&path);
         let candidate_filename = path.as_ref().file_name().map(Candidate::new);
         for (ref glob, ref syntax) in self.mappings.iter().rev() {
             if glob.is_match_candidate(&candidate)