Warn to install ostruct if json couldn't load it

hsbt · hsbt · commit fff285968d43 · 2024-04-04T11:36:47.000+09:00
diff --git a/lib/json/generic_object.rb b/lib/json/generic_object.rb
@@ -2,6 +2,7 @@
 begin
   require 'ostruct'
 rescue LoadError
+  warn "JSON::GenericObject requires 'ostruct'. Please install it with `gem install ostruct`."
 end
 
 module JSON
