module Test; end
lam = lambda {}

ree-1.8.7-2010.02 > Test.class_eval( &lam )
 => nil

ruby-1.9.2-p0 > Test.class_eval(&lam)
ArgumentError: wrong number of arguments (1 for 0)
    from (irb):2:in `block in irb_binding'
    from (irb):3:in `class_eval'
    from (irb):3
    from /home/kes/.rvm/rubies/ruby-1.9.2-p0/bin/irb:17:in `<main>'