Hi,
I was trying to implement a breadth first search where I would mutate the search queue while iterating through it. Simplified, it was something like this:
numbers = [1, 2, 3, 4] numbers.each { |number| numbers << (1+number) unless number > 3 puts number }
Modifying the object you're iterating on is undefined behavior, even in Ruby: http://www.ruby-forum.com/topic/188211#821599 It's generally easy to modify your code to either iterate on a copy of the array or looping with an index (numbers.length.times {...} or i = 0; while i < numbers.length; ..; end depending on what you want to do).
Also, is this type of exception one that should be caught by the VM and propagated as a normal Ruby Exception that I could rescue?
It should definitively be propagated as a normal Ruby exception. Could you file a ticket on trac for that?