fix(utils): make ExitCode #[must_use]

src/cli/rustup_mode.rs

@@ -864,7 +864,7 @@ async fn update(cfg: &mut Cfg<'_>, opts: UpdateOpts) -> Result<utils::ExitCode>
             }
         }
         if self_update {
-            common::self_update(|| Ok(()), cfg.process).await?;
+            exit_code &= common::self_update(|| Ok(()), cfg.process).await?;
         }
     } else {
         exit_code &= common::update_all_channels(cfg, self_update, opts.force).await?;
@@ -1205,8 +1205,7 @@ async fn component_list(
         installed_only,
         quiet,
         cfg.process,
-    )?;
-    Ok(utils::ExitCode(0))
+    )
 }
 
 async fn component_add(

src/cli/self_update.rs

@@ -496,6 +496,9 @@ pub(crate) async fn install(
     mut opts: InstallOpts<'_>,
     process: &Process,
 ) -> Result<utils::ExitCode> {
+    #[cfg_attr(not(unix), allow(unused_mut))]
+    let mut exit_code = utils::ExitCode(0);
+
     opts.validate(process).map_err(|e| {
         anyhow!(
             "Pre-checks for host and toolchain failed: {e}\n\
@@ -513,7 +516,9 @@ pub(crate) async fn install(
     }
 
     #[cfg(unix)]
-    unix::do_anti_sudo_check(no_prompt, process)?;
+    {
+        exit_code &= unix::do_anti_sudo_check(no_prompt, process)?;
+    }
 
     let mut term = process.stdout().terminal(process);
 
@@ -590,7 +595,7 @@ pub(crate) async fn install(
         windows::ensure_prompt(process)?;
     }
 
-    Ok(utils::ExitCode(0))
+    Ok(exit_code)
 }
 
 fn rustc_or_cargo_exists_in_path(process: &Process) -> Result<()> {

src/cli/setup_mode.rs

@@ -108,8 +108,7 @@ pub async fn main(
     }
 
     if dump_testament {
-        common::dump_testament(process)?;
-        return Ok(utils::ExitCode(0));
+        return common::dump_testament(process);
     }
 
     if profile == Profile::Complete {

src/utils/utils.rs

@@ -22,6 +22,7 @@ pub(crate) use crate::utils::utils::raw::is_directory;
 
 pub use crate::utils::utils::raw::{is_file, path_exists};
 
+#[must_use]
 #[derive(Debug, PartialEq, Eq)]
 pub struct ExitCode(pub i32);