From 3f07f8e8661e7ebd451af3aef247212708083bc5 Mon Sep 17 00:00:00 2001
From: Simon Sapin <simon.sapin@exyr.org>
Date: Sat, 11 Jul 2015 03:03:17 +0200
Subject: [PATCH] Replace surrogates in JS strings with U+FFFD instead of
 panicking.

Fix #6519.
See #6564.
---
 components/script/dom/bindings/conversions.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/components/script/dom/bindings/conversions.rs b/components/script/dom/bindings/conversions.rs
index 9967b6cf9b7..1a090a1ef63 100644
--- a/components/script/dom/bindings/conversions.rs
+++ b/components/script/dom/bindings/conversions.rs
@@ -355,7 +355,9 @@ pub fn jsstring_to_str(cx: *mut JSContext, s: *mut JSString) -> DOMString {
         let char_vec = unsafe {
             slice::from_raw_parts(chars as *const u16, length as usize)
         };
-        String::from_utf16(char_vec).unwrap()
+        // This is a wilful spec violation.
+        // See https://github.com/servo/servo/issues/6564
+        String::from_utf16_lossy(char_vec)
     }
 }