libsyntax: Make the parser mutable

1 files changed, 5 insertions, 5 deletions

diff --git a/src/libsyntax/ext/format.rs b/src/libsyntax/ext/format.rs
index 3bfab7da9b4..2d4bdd3da23 100644
--- a/src/libsyntax/ext/format.rs
+++ b/src/libsyntax/ext/format.rs
@@ -53,11 +53,11 @@ struct Context<'a> {
 impl<'a> Context<'a> {
     /// Parses the arguments from the given list of tokens, returning None if
     /// there's a parse error so we can continue parsing other format! expressions.
-    fn parse_args(&mut self, sp: Span,
-                  tts: &[ast::token_tree]) -> (@ast::Expr, Option<@ast::Expr>) {
-        let p = rsparse::new_parser_from_tts(self.ecx.parse_sess(),
-                                             self.ecx.cfg(),
-                                             tts.to_owned());
+    fn parse_args(&mut self, sp: Span, tts: &[ast::token_tree])
+                  -> (@ast::Expr, Option<@ast::Expr>) {
+        let mut p = rsparse::new_parser_from_tts(self.ecx.parse_sess(),
+                                                 self.ecx.cfg(),
+                                                 tts.to_owned());
         // Parse the leading function expression (maybe a block, maybe a path)
         let extra = p.parse_expr();
         if !p.eat(&token::COMMA) {