gistfile1.txt

irb(main):002:0> module Foo; def const_missing(constant); puts "nope: #{constant}"; end; end;
irb(main):003:0* Foo::BAR
NameError: uninitialized constant Foo::BAR
	from (irb):3
	from /Users/tscott/.rubies/ruby-2.2.2/bin/irb:11:in `<main>'
irb(main):004:0> module Foo; def self.const_missing(constant); puts "nope: #{constant}"; end; end;
irb(main):005:0* Foo::BAR
nope: BAR
=> nil