RoR "goto" function?

What's the goto function for Ruby on Rails?
Something like this:
x: y
if z goto x

Obviously that's not the proper syntax, but I don't know what is. :(

>>6
I don't remember much FORTRAN and I could understand that.

Are programmer's brains getting smaller and smaller? Back then we had several hundred lines of dense code, and we could write programs just fine that way, and now they're all teaching that you need to separate shit into functions if its over 30 lines. WTF.