From 2d6c10f6f40d98d9e67008496704ff3b4c23b799 Mon Sep 17 00:00:00 2001
From: kennytm <kennytm@gmail.com>
Date: Tue, 18 Jul 2017 01:49:40 +0800
Subject: [PATCH] Fix "Quasi-quoting is inefficient" warning in incremental
 rustbuild.

After #43252 is merged, building stage0 libcore with -i (--incremental)
flag will cause 17 "Quasi-quoting might make incremental compilation very
inefficient: NtExpr(..)" warnings, as in #40946.

Fixing the warning in #40946 will take 12 weeks from now to make into the
next stage0, so it is quicker to workaround it in libcore instead.
---
 src/libcore/default.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libcore/default.rs b/src/libcore/default.rs
index 244df1a9966..ab36e29b1e1 100644
--- a/src/libcore/default.rs
+++ b/src/libcore/default.rs
@@ -126,7 +126,7 @@ pub trait Default: Sized {
 }
 
 macro_rules! default_impl {
-    ($t:ty, $v:expr, $doc:expr) => {
+    ($t:ty, $v:expr, $doc:tt) => {
         #[stable(feature = "rust1", since = "1.0.0")]
         impl Default for $t {
             #[inline]