# -----Original Message-----
# From: Avi Bryant [mailto:avi / beta4.com] 
# Sent: 24 ???? 2001 ?. 6:04
# To: ruby-talk ML
# Subject: [ruby-talk:18396] Re: interfaces?
# 
# 
# On Tue, 24 Jul 2001, MikkelFJ wrote:
# 
# > I am fairly new to Ruby (the DDJ generation), so I may have missed 
# > something blatantly obvious:
# > 
# > Are there interfaces in Ruby? If not, why not?
# 
# Check out hipster's implementation at 
# http://www.xs4all.nl/~hipster/lib/ruby/interface-abstract
# 
# 

In addition one may type "implements" in any place inside the class
definition body! This is very useful.