From ff3efb4e04ed2e915bda0cef3d2c7c9e4145ab34 Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Mon, 30 Jul 2018 14:49:01 +0200
Subject: [PATCH] clarify error message when sysroot was not found

---
 src/bin/miri.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/bin/miri.rs b/src/bin/miri.rs
index e380317138a..58897541491 100644
--- a/src/bin/miri.rs
+++ b/src/bin/miri.rs
@@ -200,7 +200,8 @@ fn find_sysroot() -> String {
         _ => {
             option_env!("RUST_SYSROOT")
                 .expect(
-                    "need to specify RUST_SYSROOT env var or use rustup or multirust",
+                    "Could not find sysroot. Either set MIRI_SYSROOT at run-time, or at \
+                     build-time specify RUST_SYSROOT env var or use rustup or multirust",
                 )
                 .to_owned()
         }