chore: fix new clippy warnings

Author: rami3l

src/cli/markdown.rs

@@ -195,8 +195,8 @@ impl<'a> LineFormatter<'a> {
             }
             TagEnd::Strong => {}
             TagEnd::Strikethrough => {}
-            TagEnd::Link { .. } => {}
-            TagEnd::Image { .. } => {} // shouldn't happen, handled in start
+            TagEnd::Link => {}
+            TagEnd::Image => {} // shouldn't happen, handled in start
             TagEnd::FootnoteDefinition => {}
             TagEnd::MetadataBlock(_) => {}
             TagEnd::Superscript => {}

src/cli/self_update.rs

@@ -1048,13 +1048,8 @@ fn get_and_parse_new_rustup_version(path: &Path) -> Option<String> {
 }
 
 fn get_new_rustup_version(path: &Path) -> Option<String> {
-    match Command::new(path).arg("--version").output() {
-        Err(_) => None,
-        Ok(output) => match String::from_utf8(output.stdout) {
-            Ok(version) => Some(version),
-            Err(_) => None,
-        },
-    }
+    let output = Command::new(path).arg("--version").output().ok()?;
+    String::from_utf8(output.stdout).ok()
 }
 
 fn parse_new_rustup_version(version: String) -> String {

src/toolchain.rs

@@ -204,7 +204,7 @@ impl<'a> Toolchain<'a> {
             .cfg
             .process
             .var_os(sysenv::LOADER_PATH)
-            .filter(|x| x.len() > 0)
+            .filter(|x| !x.is_empty())
             .is_none()
         {
             // These are the defaults when DYLD_FALLBACK_LIBRARY_PATH isn't