From a5b6cb6b433516068a8810f8eb9da894c2c3d8e9 Mon Sep 17 00:00:00 2001
From: Simon Sapin <simon.sapin@exyr.org>
Date: Mon, 13 Jul 2015 20:58:21 +0200
Subject: [PATCH] Unpaired surrogates: Document the -Z flag in the panic
 message.

---
 components/script/dom/bindings/conversions.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/components/script/dom/bindings/conversions.rs b/components/script/dom/bindings/conversions.rs
index 4a64b87783e..9f6ed02a289 100644
--- a/components/script/dom/bindings/conversions.rs
+++ b/components/script/dom/bindings/conversions.rs
@@ -373,7 +373,8 @@ pub fn jsstring_to_str(cx: *mut JSContext, s: *mut JSString) -> DOMString {
                         error!(message!());
                         s.push('\u{FFFD}');
                     } else {
-                        panic!(message!());
+                        panic!(concat!(message!(), " Use `-Z replace-surrogates` \
+                            on the command line to make this non-fatal."));
                     }
                 }
             }