From 28ce23fe8bfee55a0810b4347423e66c7621650a Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Tue, 23 Apr 2019 00:05:06 +0300
Subject: [PATCH] simplify and avoid allocation

---
 src/libsyntax/parse/lexer/mod.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/libsyntax/parse/lexer/mod.rs b/src/libsyntax/parse/lexer/mod.rs
index 61322985b9a5d..cf8f8abe2ab50 100644
--- a/src/libsyntax/parse/lexer/mod.rs
+++ b/src/libsyntax/parse/lexer/mod.rs
@@ -1418,8 +1418,8 @@ impl<'a> StringReader<'a> {
                     // Include the leading `'` in the real identifier, for macro
                     // expansion purposes. See #12512 for the gory details of why
                     // this is necessary.
-                    let ident = self.with_str_from(start, |lifetime_name| {
-                        self.mk_ident(&format!("'{}", lifetime_name))
+                    let ident = self.with_str_from(start_with_quote, |lifetime_name| {
+                        self.mk_ident(lifetime_name)
                     });
 
                     if c2.is_numeric() {