Ruby - editing gem source code has no effect

I'm debugging the nested_set gem which is under C:\Ruby187\lib\ruby\gems\1.8\gems\nested_set-1.6.4\lib\nested_set

I make changes to files in there, but it seems to have no effect when I refresh the page. I deleted the cache file in C:\Ruby187\lib\ruby\gems\1.8\cache to no effect.

Is there some sort of caching I should know abou开发者_开发百科t?

If it is rails you need to restart your server

Have you run gem env from the command line to check that's what's being used?