How to find a module's location

Question

I am in a situation that n a gem foo_bar that I have written, and which I use as follows:

require 'foo_bar'
include FooBar

suddendly, a constant Baz appeared:

defined? Baz #=> :constant
Baz.class #=> Module

I forgot where did I define Baz. If it had any instance methods, I could use #source_location method to find the file where I defined Baz. But it has none:

Baz.instance_methods #=> []

How do I find in which file (or where) a module that popped up in my top namespace is defined?

Additional addmission and finding: The constant I am talking about is Net, and its appearance is not tied to include FooBar, but to another line, require of my gem sy (http://gihub.com/boris-s/sy), which you can install by gem install sy. By stepping the gem (https://github.com/boris-s/sy/blob/master/lib/sy.rb), I found that none of the require lines, or the top lines up to the module SY line does not trigger Net appearance. The module SY definition does.

Furthermore, I found the pragmatic answer Net is Net as in Net::HTTP. The authors didn't assume that someone would be working with other kinds of nets than internets, and I didn't think about Net::HTTP, because I was working with Petri nets and defining my own Net classes. Although I solved my practical problem, it is still interesting to find the general answer of finding modules' sources.

Answer 1

Assuming a file is loaded you can do:

$LOADED_FEATURES.select { |file| File.read(file).include?('module Foo') rescue false }