Hi,

At Fri, 20 Feb 2009 20:49:35 +0900,
Urabe Shyouhei wrote in [ruby-core:22289]:
> What do you mean here in "official"? because AFAIK there has been no single
> line of official syntax definitions so far.

Matz's book and official tutorial[1] mention about "then" but
not ":".  Is there any description about such colons?

[1] http://www.ruby-doc.org/docs/ProgrammingRuby/html/tut_expressions.html

-- 
Nobu Nakada