feat(cli): show the toolchain path with rustup show active-toolchain --verbose

Author: rami3l

src/cli/rustup_mode.rs

@@ -1092,8 +1092,9 @@ fn show_active_toolchain(cfg: &Cfg<'_>, verbose: bool) -> Result<utils::ExitCode
             if verbose {
                 writeln!(
                     cfg.process.stdout().lock(),
-                    "compiler: {}",
-                    toolchain.rustc_version()
+                    "compiler: {}\npath: {}",
+                    toolchain.rustc_version(),
+                    toolchain.path().display(),
                 )?;
             }
         }

tests/suite/cli_rustup.rs

@@ -1249,7 +1249,13 @@ async fn show_active_toolchain_with_verbose() {
                 r"nightly-{0}
 active because: it's the default toolchain
 compiler: 1.3.0 (hash-nightly-2)
-"
+path: {1}
+",
+                cx.config
+                    .rustupdir
+                    .join("toolchains")
+                    .join(for_host!("nightly-{0}"))
+                    .display()
             ),
             r"",
         )