lib/r2-oas/support/deprecation.rb in r2-oas-0.4.0 vs lib/r2-oas/support/deprecation.rb in r2-oas-0.4.1

@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
+require 'singleton'
+
 require_relative 'deprecation/instance_delegator'
 require_relative 'deprecation/reporting'
 require_relative 'deprecation/behavior'
 
 module R2OAS