refactor(config)!: make resolve_toolchain() sync

Author: rami3l

src/cli/rustup_mode.rs

@@ -908,7 +908,7 @@ async fn which(
     binary: &str,
     toolchain: Option<ResolvableToolchainName>,
 ) -> Result<utils::ExitCode> {
-    let binary_path = cfg.resolve_toolchain(toolchain).await?.binary_file(binary);
+    let binary_path = cfg.resolve_toolchain(toolchain)?.binary_file(binary);
 
     utils::assert_is_file(&binary_path)?;
 

src/config.rs

@@ -709,7 +709,7 @@ impl<'a> Cfg<'a> {
         Ok(Some(Toolchain::new(self, name)?.rustc_version()))
     }
 
-    pub(crate) async fn resolve_toolchain(
+    pub(crate) fn resolve_toolchain(
         &self,
         name: Option<ResolvableToolchainName>,
     ) -> Result<Toolchain<'_>> {