"run Proc.new" using "do ... end" fails ("{ }" required)

["Iñaki Baz Castillo" <ibc@aliax.net>]

Hi, the following works:


1	::Rack::Builder.new do
2		map "/" do
3			run Proc.new { |env|
4				[ 404, {"Content-Type" => "text/plain"}), [""] ]
5			}
6		end
7	end


but the following gives an error:

1	::Rack::Builder.new do
2		map "/" do
3			run Proc.new do |env|
4				[ 404, {"Content-Type" => "text/plain"}), [""] ]
5			end
6		end
7	end

/home/me/myfile.rb:3:in `new': tried to create Proc object without a block (ArgumentError)
from /home/me/myfile.rb:3:in `block (2 levels) in core'
from /usr/local/lib/ruby1.9/gems/1.9.1/gems/rack-1.0.0/lib/rack/builder.rb:29:in `instance_eval'
from /usr/local/lib/ruby1.9/gems/1.9.1/gems/rack-1.0.0/lib/rack/builder.rb:29:in `initialize'
from /usr/local/lib/ruby1.9/gems/1.9.1/gems/rack-1.0.0/lib/rack/builder.rb:46:in `new'
from /usr/local/lib/ruby1.9/gems/1.9.1/gems/rack-1.0.0/lib/rack/builder.rb:46:in `map'
from /root/svn_local_copies/OpenXDMS/trunk/lib/rack/core.rb:46:in `block in core'
from /usr/local/lib/ruby1.9/gems/1.9.1/gems/rack-1.0.0/lib/rack/builder.rb:29:in `instance_eval'
from /usr/local/lib/ruby1.9/gems/1.9.1/gems/rack-1.0.0/lib/rack/builder.rb:29:in `initialize'
from /home/me/myfile.rb:1:in `new'
...


It fails in ruby 1.8 and 1.9. Why cannot I use "do-end" syntax for a block
instead of "{ }". Of course, Proc.new does allow "do-end" syntax, so I wonder
if this issue has something to do with Rack itself.


Thanks.


-- 
Iñaki Baz Castillo <ibc@aliax.net>