I tested this script with "Try Ruby! (in your browser)" (http://tryruby.hobix.com/). >> RUBY_VERSION => "1.8" >> eval "a=1" => 1 >> a => 1 It is the same as my expectation. But when I try with Ruby 1.9 in my computer... irb(main):001:0> RUBY_VERSION => "1.9.0" irb(main):002:0> eval "a=1" => 1 irb(main):003:0> a NameError: undefined local variable or method `a' for main:Object ... I read from somewhere that now Ruby can't dynamically create local variable. Is it true or just a bug? Sorry with my poor english. -- Posted via http://www.ruby-forum.com/.