bootstrap: fix warnings

Signed-off-by: onur-ozkan <work@onurozkan.dev>

src/bootstrap/src/core/build_steps/run.rs

@@ -1,8 +1,6 @@
 use std::path::PathBuf;
 use std::process::Command;
 
-use clap_complete::shells;
-
 use crate::core::build_steps::dist::distdir;
 use crate::core::build_steps::test;
 use crate::core::build_steps::tool::{self, SourceType, Tool};

src/bootstrap/src/utils/bin_helpers.rs

@@ -18,6 +18,7 @@ pub(crate) fn parse_rustc_verbose() -> usize {
 /// Parses the value of the "RUSTC_STAGE" environment variable and returns it as a `String`.
 ///
 /// If "RUSTC_STAGE" was not set, the program will be terminated with 101.
+#[allow(unused)]
 pub(crate) fn parse_rustc_stage() -> String {
     std::env::var("RUSTC_STAGE").unwrap_or_else(|_| {
         // Don't panic here; it's reasonable to try and run these shims directly. Give a helpful error instead.