Method not available on this version
This method is only available on newer versions.
The first available version (v2_6_3) is shown here.
collect_method(opt)
private
# File lib/bundler/vendor/fileutils/lib/fileutils.rb, line 1549
def self.collect_method(opt)
OPT_TABLE.keys.select {|m| OPT_TABLE[m].include?(opt) }
end