Address some deprecation warnings

Author: nrc

build.rs

@@ -30,7 +30,7 @@ fn main() {
 // (git not installed or if this is not a git repository) just return an empty string.
 fn commit_info() -> String {
     match (commit_hash(), commit_date()) {
-        (Ok(hash), Ok(date)) => format!(" ({} {})", hash.trim_right(), date),
+        (Ok(hash), Ok(date)) => format!(" ({} {})", hash.trim_end(), date),
         _ => String::new(),
     }
 }

src/download/tests/support/mod.rs

@@ -70,9 +70,9 @@ fn serve_contents(
         // extract range "bytes={start}-"
         let range = range.to_str().expect("unexpected Range header");
         assert!(range.starts_with("bytes="));
-        let range = range.trim_left_matches("bytes=");
+        let range = range.trim_start_matches("bytes=");
         assert!(range.ends_with("-"));
-        let range = range.trim_right_matches("-");
+        let range = range.trim_end_matches("-");
         assert_eq!(range.split("-").count(), 1);
         let start: u64 = range.parse().expect("unexpected Range header");
 

src/rustup-cli/common.rs

@@ -256,7 +256,7 @@ pub fn rustc_version(toolchain: &Toolchain) -> String {
                             .expect("Child::stdout requested but not present");
                         let mut line = String::new();
                         if BufReader::new(out).read_line(&mut line).is_ok() {
-                            let lineend = line.trim_right_matches(&['\r', '\n'][..]).len();
+                            let lineend = line.trim_end_matches(&['\r', '\n'][..]).len();
                             line.truncate(lineend);
                             line1 = Some(line);
                         }

src/rustup-cli/rustup_mode.rs

@@ -734,7 +734,7 @@ fn show(cfg: &Cfg) -> Result<()> {
                 }
             },
             Err(err) => {
-                if let Some(cause) = err.cause() {
+                if let Some(cause) = err.source() {
                     println!("(error: {}, {})", err, cause);
                 } else {
                     println!("(error: {})", err);

src/rustup/config.rs

@@ -86,7 +86,7 @@ impl Cfg {
                     .and_then(utils::if_not_empty)
                     .map_or(Cow::Borrowed(dist::DEFAULT_DIST_ROOT), Cow::Owned)
                     .as_ref()
-                    .trim_right_matches("/dist")
+                    .trim_end_matches("/dist")
                     .to_owned()
             }
         };