From 49392fce53f938fda5b34673c98001ac7fea5d0f Mon Sep 17 00:00:00 2001
From: topecongiro <seuchida@gmail.com>
Date: Thu, 2 Nov 2017 07:13:14 +0900
Subject: [PATCH] Avoid panicking when no arg is given to clippy_driver

---
 src/driver.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/driver.rs b/src/driver.rs
index df0ff4c3f1f..8e4114bac1b 100644
--- a/src/driver.rs
+++ b/src/driver.rs
@@ -163,6 +163,9 @@ pub fn main() {
         // Setting RUSTC_WRAPPER causes Cargo to pass 'rustc' as the first argument.
         // We're invoking the compiler programatically, so we ignore this/
         let mut orig_args: Vec<String> = env::args().collect();
+        if orig_args.len() <= 1 {
+            std::process::exit(1);
+        }
         if orig_args[1] == "rustc" {
             // we still want to be able to invoke it normally though
             orig_args.remove(1);