From: Brian Candler <b.candler@...>
Date: 2009-01-30T19:19:51+09:00
Subject: Re: replacing callcc by catch/throw

Tanaka Akira wrote:
> The argument of catch is optional in Ruby 1.9.
> 
>   catch {|tag|
>     throw tag
>   }
> 
> catch generates a unique tag if not given.

... and I see that even with an explicit tag, it doesn't have to be a 
symbol any more.

$ ruby19 -e "catch(Object.new) { }"
$ ruby -e "catch(Object.new) { }"
-e:1:in `catch': #<Object:0xb7e0adb4> is not a symbol (TypeError)
  from -e:1
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