For what it's worth, if you're just looking to get at the innards of a method, Pry does this job admirably. https://gist.github.com/cheald/6674718 https://gist

For what it's worth, if you're just looking to get at the innards of a method, Pry does this job admirably. https://gist.github.com/cheald/6674718 https://gist.github.com/cheald/6674718 https://github.com/pry/pry/wiki/Source-browsing https://github.com/pry/pry/wiki/Source-browsing Or to get the source as a string: > require 'pry' > Nokogiri.method(:HTML).source => " def HTML thing, url = nil, encoding = nil, options = XML::ParseOptions::DEFAULT_HTML, &block\n Nokogiri::HTML::Document.parse(thing, url, encoding, options, &block)\n end\n"