From 4133b160363143b975cf9927cff87d183f1f5405 Mon Sep 17 00:00:00 2001
From: Oliver Schneider <git-spam-no-reply9815368754983@oli-obk.de>
Date: Fri, 16 Mar 2018 11:48:32 +0100
Subject: [PATCH] Only generate miri backtraces if explicitly requested

---
 src/librustc/mir/interpret/error.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/librustc/mir/interpret/error.rs b/src/librustc/mir/interpret/error.rs
index 51660b180cd98..9e69990f22c0d 100644
--- a/src/librustc/mir/interpret/error.rs
+++ b/src/librustc/mir/interpret/error.rs
@@ -20,7 +20,7 @@ pub struct EvalError<'tcx> {
 
 impl<'tcx> From<EvalErrorKind<'tcx>> for EvalError<'tcx> {
     fn from(kind: EvalErrorKind<'tcx>) -> Self {
-        let backtrace = match env::var("RUST_BACKTRACE") {
+        let backtrace = match env::var("MIRI_BACKTRACE") {
             Ok(ref val) if !val.is_empty() => Some(Backtrace::new_unresolved()),
             _ => None
         };