From d82d4b66f24e21dd124e1b4765939b230cec3685 Mon Sep 17 00:00:00 2001
From: Niko Matsakis <niko@alum.mit.edu>
Date: Tue, 17 Jan 2017 17:56:03 -0500
Subject: [PATCH] tolerate `None` return from `get_line`

---
 src/libsyntax/json.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libsyntax/json.rs b/src/libsyntax/json.rs
index a1c273baeea..adab76309fe 100644
--- a/src/libsyntax/json.rs
+++ b/src/libsyntax/json.rs
@@ -296,7 +296,7 @@ impl DiagnosticSpanLine {
                          h_end: usize)
                          -> DiagnosticSpanLine {
         DiagnosticSpanLine {
-            text: fm.get_line(index).unwrap().to_owned(),
+            text: fm.get_line(index).unwrap_or("").to_owned(),
             highlight_start: h_start,
             highlight_end: h_end,
         }