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Ah, I didn't know that Proc.new != proc/lambda :)

They both return Proc objects though, so I wonder if it is possible to "convert" them.

One small note, as pointed out in http://innig.net/software/ruby/closures-in-ruby.rb posted by arohner above: although in 1.8 proc is an alias for lambda, in 1.9 it's now an alias for Proc.new.