From cc336319ffb58368dc344ccca0c2781bbeefa158 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Johannes=20M=C3=BCller?= <straightshoota@gmail.com>
Date: Sun, 15 Jan 2023 14:22:06 +0100
Subject: [PATCH] Avoid `Array` allocation in `Channel.select(Tuple)`

---
 src/channel.cr | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/channel.cr b/src/channel.cr
index 151972418012..c9107f00222c 100644
--- a/src/channel.cr
+++ b/src/channel.cr
@@ -431,6 +431,11 @@ class Channel(T)
       # * `StaticArray`: This avoids a heap allocation because we can dup a
       #   static array on the stack.
       ops_locks = ops.dup
+    elsif ops.responds_to?(:to_static_array)
+      # If the collection type implements `to_static_array` we can create a
+      # copy without allocating an array. This applies to `Tuple` types, which
+      # the compiler generates for `select` expressions.
+      ops_locks = ops.to_static_array
     else
       ops_locks = ops.to_a
     end