From: "Wolfgang Nádasi-Donner" Date: 2009-03-08T22:22:24+09:00 Subject: [ruby-core:22736] Ruby 1.9.1 and tail recursion optimization Moin, moin! I was a little bit surprized that the following code snippets run into stack overflow... myprompt> irb191-p0 irb(main):001:0> def a irb(main):002:1> b=2+1 irb(main):003:1> a irb(main):004:1> end => nil irb(main):005:0> a ...and... myprompt> irb191-p0 irb(main):001:0> f = lambda{print "-";STDOUT.flush;f[]} => # irb(main):002:0> f[] ...because I thought Ruby 1.9.1 has tail recursion optimization implemented. Was this a wrong assumption? Wolfgang N�dasi-Donner