From 0f257df31a1c7684f8d1824a4b0e776236d23a0e Mon Sep 17 00:00:00 2001
From: Seo Sanghyeon <sanxiyn@gmail.com>
Date: Tue, 17 May 2016 20:37:07 +0900
Subject: [PATCH] Preserve span when lowering ExprKind::Paren

---
 src/librustc/hir/lowering.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/librustc/hir/lowering.rs b/src/librustc/hir/lowering.rs
index 0c3c190064b0..ea47b0924bc0 100644
--- a/src/librustc/hir/lowering.rs
+++ b/src/librustc/hir/lowering.rs
@@ -1260,8 +1260,9 @@ impl<'a> LoweringContext<'a> {
                                     maybe_expr.as_ref().map(|x| self.lower_expr(x)))
                 }
                 ExprKind::Paren(ref ex) => {
-                    // merge attributes into the inner expression.
                     return self.lower_expr(ex).map(|mut ex| {
+                        ex.span = e.span;
+                        // merge attributes into the inner expression.
                         ex.attrs.update(|attrs| {
                             attrs.prepend(e.attrs.clone())
                         });