From 9a86e6818f2e3c92ffb15b2fd0e768243bfc4d43 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Tue, 27 Sep 2016 00:47:54 -0700
Subject: [PATCH] Use push_str to support old compilers

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

diff --git a/serde_codegen_internals/src/ctxt.rs b/serde_codegen_internals/src/ctxt.rs
index 55ec5582..a1455332 100644
--- a/serde_codegen_internals/src/ctxt.rs
+++ b/serde_codegen_internals/src/ctxt.rs
@@ -25,8 +25,8 @@ impl Ctxt {
             n => {
                 let mut msg = format!("{} errors:", n);
                 for err in errors {
-                    msg += "\n\t# ";
-                    msg += &err;
+                    msg.push_str("\n\t# ");
+                    msg.push_str(&err);
                 }
                 Err(msg)
             }