Add missing require "concurrent/set.rb".

ioquatix · eregon · commit 244c6d0469b1 · 2023-01-23T15:10:31.000+01:00
diff --git a/spec/concurrent/atomic/reentrant_read_write_lock_spec.rb b/spec/concurrent/atomic/reentrant_read_write_lock_spec.rb
@@ -2,6 +2,7 @@
 require 'concurrent/atomic/reentrant_read_write_lock'
 require 'concurrent/atomic/count_down_latch'
 require 'concurrent/atomic/atomic_boolean'
+require 'concurrent/set'
 require 'timeout'
 require 'fiber'
 
