Find the path that Ruby's require statement tries to load. This is actually inaccurate as it misses steps like checking an absolute path, but it worked for my use case.

debug require loadpath.rb

def debug_require(path)
  $LOAD_PATH.each do |lp|
    full_path = "#{lp}/#{path}"
    puts full_path if File.file?(full_path)
    full_rb_path = "#{full_path}.rb"
    puts full_rb_path if File.file?(full_rb_path)
  end
end