From e5a41e5682c55626e95a36fe9fa0814af5d24f6b Mon Sep 17 00:00:00 2001
From: Seiichi Uchida <seuchida@gmail.com>
Date: Sun, 26 Aug 2018 13:19:44 +0900
Subject: [PATCH 1/3] Add a test for #2953

---
 tests/target/obsolete_in_place.rs | 9 +++++++++
 1 file changed, 9 insertions(+)
 create mode 100644 tests/target/obsolete_in_place.rs

diff --git a/tests/target/obsolete_in_place.rs b/tests/target/obsolete_in_place.rs
new file mode 100644
index 000000000000..3f364c1aecdc
--- /dev/null
+++ b/tests/target/obsolete_in_place.rs
@@ -0,0 +1,9 @@
+// #2953
+
+macro_rules! demo {
+    ($a:ident <- $b:expr) => {};
+}
+
+fn main() {
+    demo!(i <- 0);
+}

From 6aae9d870fcd9f30d265d3f287627ac5fbad8f4f Mon Sep 17 00:00:00 2001
From: Seiichi Uchida <seuchida@gmail.com>
Date: Sun, 26 Aug 2018 13:20:07 +0900
Subject: [PATCH 2/3] Remove an unnecessary attribute

---
 src/lib.rs | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/lib.rs b/src/lib.rs
index 89dcf6f5ff38..7ebb967a494c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -8,7 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(tool_attributes)]
 #![feature(decl_macro)]
 #![allow(unused_attributes)]
 #![feature(type_ascription)]

From 78a0cde5bfb337af1812b06a73819cbb5ad61f06 Mon Sep 17 00:00:00 2001
From: Seiichi Uchida <seuchida@gmail.com>
Date: Sun, 26 Aug 2018 13:20:25 +0900
Subject: [PATCH 3/3] Format in-place expression like assignment

---
 src/expr.rs | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/expr.rs b/src/expr.rs
index fdea683df0a4..74639c6ef63d 100644
--- a/src/expr.rs
+++ b/src/expr.rs
@@ -338,8 +338,10 @@ pub fn format_expr(
                 ))
             }
         }
-        // FIXME(#2743)
-        ast::ExprKind::ObsoleteInPlace(..) => unimplemented!(),
+        ast::ExprKind::ObsoleteInPlace(ref lhs, ref rhs) => lhs
+            .rewrite(context, shape)
+            .map(|s| s + " <-")
+            .and_then(|lhs| rewrite_assign_rhs(context, lhs, &**rhs, shape)),
         ast::ExprKind::Async(capture_by, _node_id, ref block) => {
             let mover = if capture_by == ast::CaptureBy::Value {
                 "move "