IronRuby download file using the WebClient "Not enough storage is available to process this command"

Question

Entering the following two lines into an interactive window in IronRuby interactive console.

wc = System::Net::WebClient.new
doc = wc.DownloadString("http://yahoo.com")

I get the following error.

=> mscorlib:0:in `WinIOError': Not enough storage is available to process this command.\r\n (IOError)
    from mscorlib:0:in `Write'
    from (ir):1

Edit: looks like it's related to strings in general. The following produces the same error
x = "String" * 40000

Edit: looks like my problems are related to interactive console.
http://rubyforge.org/tracker/index.php?func=detail&aid=23485&group_id=4359&atid=16798

if I use this

wc = System::Net::WebClient.new
doc = wc.DownloadString("http://yahoo.com"); nil

it works...