From cf1406c4e37b0c0710788aa81c989618650b8e43 Mon Sep 17 00:00:00 2001
From: Georg Brandl <georg@python.org>
Date: Thu, 1 Nov 2018 09:52:14 +0100
Subject: [PATCH] Clarify error message for -C opt-level

The new levels s and z are not mentioned as possible values.
---
 src/librustc/session/config.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/librustc/session/config.rs b/src/librustc/session/config.rs
index 569e7a24d2353..459a748dd6a60 100644
--- a/src/librustc/session/config.rs
+++ b/src/librustc/session/config.rs
@@ -2083,7 +2083,7 @@ pub fn build_session_options_and_crate_config(
                         error_format,
                         &format!(
                             "optimization level needs to be \
-                             between 0-3 (instead was `{}`)",
+                             between 0-3, s or z (instead was `{}`)",
                             arg
                         ),
                     );