Merge pull request #2738 from hi-rustin/rustin-patch-fix-arg0

Add DUP_TOOLS as supported arg0

Author: kinnison

src/bin/rustup-init.rs

@@ -28,7 +28,7 @@ use rustup::cli::setup_mode;
 use rustup::currentprocess::{process, with, OSProcess};
 use rustup::env_var::RUST_RECURSION_COUNT_MAX;
 use rustup::utils::utils;
-use rustup::TOOLS;
+use rustup::{TOOLS, DUP_TOOLS};
 
 fn main() {
     let process = OSProcess::default();
@@ -94,7 +94,7 @@ fn run_rustup_inner() -> Result<utils::ExitCode> {
             }
         }
         Some(n) => {
-            if TOOLS.iter().find(|&&name| name == n).is_some() {
+            if TOOLS.iter().chain(DUP_TOOLS.iter()).find(|&&name| name == n).is_some() {
                 proxy_mode::main()
             } else {
                 Err(ErrorKind::UnknownProxyName(n.to_string()).into())