From b514ec5fe61046643218ee18ebe3a6c842ef45df Mon Sep 17 00:00:00 2001
From: Aaron Gyes <var.log@icloud.com>
Date: Thu, 7 Apr 2022 09:22:56 -0700
Subject: [PATCH] append_narrow_buffer takes const reference

---
 src/io.cpp | 2 +-
 src/io.h   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/io.cpp b/src/io.cpp
index 9e86ebebc..c2a1de33f 100644
--- a/src/io.cpp
+++ b/src/io.cpp
@@ -307,7 +307,7 @@ shared_ptr<const io_data_t> io_chain_t::io_for_fd(int fd) const {
     return nullptr;
 }
 
-void output_stream_t::append_narrow_buffer(separated_buffer_t buffer) {
+void output_stream_t::append_narrow_buffer(const separated_buffer_t &buffer) {
     for (const auto &rhs_elem : buffer.elements()) {
         append_with_separation(str2wcstring(rhs_elem.contents), rhs_elem.separation, false);
     }
diff --git a/src/io.h b/src/io.h
index 55247f9a8..b1aa81558 100644
--- a/src/io.h
+++ b/src/io.h
@@ -384,7 +384,7 @@ class output_stream_t : noncopyable_t, nonmovable_t {
     void push_back(wchar_t c) { append(c); }
 
     // Append data from a narrow buffer, widening it.
-    void append_narrow_buffer(separated_buffer_t buffer);
+    void append_narrow_buffer(const separated_buffer_t &buffer);
 
     /// Append a format string.
     void append_format(const wchar_t *format, ...) {