Update to rust 2021

manager/src/builder.rs

@@ -51,7 +51,7 @@ async fn dir(cfg: &Config, env: &Env, relative: PathBuf) -> Result<(), Errors> {
     let mut dir_tasks = vec![];
     let mut file_tasks = vec![];
 
-    while let Some(entry) = walker.next_entry().await.with_location(&&template_path)? {
+    while let Some(entry) = walker.next_entry().await.with_location(&template_path)? {
         let meta = entry.metadata().await.with_location(&entry.path())?;
         let new_relative = relative.join(entry.file_name());
 
@@ -98,7 +98,7 @@ async fn file(cfg: &Config, env: &Env, relative: PathBuf) -> Result<(), Error> {
         let mut rendered = Vec::<u8>::new();
         parse_template(&file_str)
             .with_location(&template_path)?
-            .write(&env, &mut rendered)
+            .write(env, &mut rendered)
             .with_location(&template_path)?;
         let rendered = std::str::from_utf8(&rendered).unwrap();
 
@@ -122,7 +122,7 @@ fn get_username() -> String {
     env::var("USER")
         .ok()
         .or_else(|| env::var("USERNAME").ok())
-        .unwrap_or_else(|| String::new())
+        .unwrap_or_else(String::new)
 }
 
 async fn get_hostname() -> String {
@@ -140,8 +140,8 @@ async fn get_hostname() -> String {
 
     read_hostname_file()
         .await
-        .or_else(|| run_hostname_cmd())
-        .unwrap_or_else(|| String::new())
+        .or_else(run_hostname_cmd)
+        .unwrap_or_else(String::new)
         .trim()
         .to_string()
 }