From 040f1c06bc7c1c5fa37477513227114d343b3ec3 Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Wed, 18 Sep 2013 13:51:07 -0700
Subject: Allow trailing commas in format!

This is more consistent with other parts of the language and it also makes it
easier to use in situations where format string is massive.
---
 src/libsyntax/ext/format.rs | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src/libsyntax')

diff --git a/src/libsyntax/ext/format.rs b/src/libsyntax/ext/format.rs
index 9f4e55b1a92..cace4648df2 100644
--- a/src/libsyntax/ext/format.rs
+++ b/src/libsyntax/ext/format.rs
@@ -76,6 +76,7 @@ impl Context {
                 self.ecx.span_err(sp, "expected token: `,`");
                 return (extra, None);
             }
+            if *p.token == token::EOF { break } // accept trailing commas
             if named || (token::is_ident(p.token) &&
                          p.look_ahead(1, |t| *t == token::EQ)) {
                 named = true;
-- 
cgit 1.4.1-3-g733a5