Your code causes an infinite loop. It's because you're calling #to_s recursively. It has nothing to do with re-opening NSDate. The same happens with the original version of Ruby, BTW. $ ruby19 -e "class Foo; def to_s; p '%p' % self; end; end; p Foo.new" -e:1: stack level too deep (SystemStackError) Laurent On Feb 6, 2010, at 2:40 PM, steve ross wrote:

This code creates an EXC_BAD_ACCESS error:

class NSDate def to_s NSLog "#{__LINE__} NSDate#to_s %@", self 'hello' end end

NSDate.date.to_s

If I change the NSLog statement to:

NSLog "#{__LINE__} NSDate#to_s hello"

Then I get the log entry and no EXC_BAD_ACCESS. Any idea what's causing this?

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