2 files changed, 4 insertions, 3 deletions
diff --git a/src/expr.rs b/src/expr.rs
index fdea683df0a..74639c6ef63 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 "
diff --git a/src/lib.rs b/src/lib.rs
index 89dcf6f5ff3..7ebb967a494 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)]