You know how I blogged yesterday about why's little meta-programming trick in Ruby? Well, as it turns out, it is just as easy, if not easier, to do in Io.

Trial := Object clone do(
  runMe := method(
    self runMe = method(Exception raise("NO MORE."))
    writeln("Your trial period has ended.")     
  )
)

t := Trial clone
t.runMe #=> Your trial period has ended.
t.runMe #=> Exception: NO MORE.

I don't know why I had any doubts.