From 3cf73f40fb7217471dfe7394b73e67f53cfefc49 Mon Sep 17 00:00:00 2001
From: Alex Burka <alex@alexburka.com>
Date: Tue, 6 Feb 2018 14:43:01 +0000
Subject: [PATCH] proc_macro: don't panic parsing ..= (fix #47950)

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

diff --git a/src/libproc_macro/lib.rs b/src/libproc_macro/lib.rs
index b9e816baac0dc..6768e0ade4304 100644
--- a/src/libproc_macro/lib.rs
+++ b/src/libproc_macro/lib.rs
@@ -685,7 +685,7 @@ impl TokenTree {
                 })
             }
 
-            DotEq => unreachable!(),
+            DotEq => joint!('.', Eq),
             OpenDelim(..) | CloseDelim(..) => unreachable!(),
             Whitespace | Comment | Shebang(..) | Eof => unreachable!(),
         };