I played around with something to give me the list of receivers for any Ruby object in my introspection gem. If you load the "introspection/receivers" file you get a method #receivers on any object which gives you the whole receiver chain.

Introducing Module#const_source_locationUsing Method#source_location made finding the location of any method fairly easy. Unfortunately, there wasn’t an equivalent for constants. This meant that unless the constant you needed to find was defined in your codebase, finding its source location was not easy.