example of autoload not playing well

some_files.rb

# ~/workspace/autoload-example ls -l
# total 24
# -rw-r--r--  1 andrew.lee  588821037  86 Nov 18 22:42 mod.rb
# -rw-r--r--  1 andrew.lee  588821037  94 Nov 18 22:47 not-working.rb
# -rw-r--r--  1 andrew.lee  588821037  76 Nov 18 22:45 works.rb

# mod.rb
module Mod
  class Foo
    def self.call
      puts 'hi this works'
    end
  end
end



# works.rb
$LOAD_PATH << File.expand_path(__dir__)
autoload :Mod, 'mod'

Mod::Foo.call
# ruby works.rb
#
# hi this works



# not-working.rb
$LOAD_PATH << File.expand_path(__dir__)

module Mod; end

autoload :Mod, 'mod'

Mod::Foo.call
# ruby not-working.rb
# 
# Traceback (most recent call last):
# not-working.rb:7:in `<main>': uninitialized constant Mod::Foo (NameError)