From 842cd13bd1dcb6ef9971fd6ff550cbca486689c2 Mon Sep 17 00:00:00 2001
From: Dan Gohman <sunfish@mozilla.com>
Date: Wed, 9 May 2018 07:52:18 -1000
Subject: [PATCH] Improve the error message when python isn't installed.

---
 lib/codegen/build.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/codegen/build.rs b/lib/codegen/build.rs
index 69100ef00f..87d4b754ae 100644
--- a/lib/codegen/build.rs
+++ b/lib/codegen/build.rs
@@ -67,7 +67,9 @@ fn main() {
         .arg("--out-dir")
         .arg(out_dir)
         .status()
-        .expect("Failed to launch second-level build script");
+        .expect(
+            "Failed to launch second-level build script; is python installed?",
+        );
     if !status.success() {
         process::exit(status.code().unwrap());
     }