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Created attachment 1894 [details]
It appears that when you close over a variable inside a loop that is, in turn, inside an iterator method, the variable is not properly scoped and may end up with the wrong value when the delegate is called. This is a bit convoluted, but see the attached repro.
Compiled in .NET 3.5/4.0/4.5, the output is "foo", but in Mono 2.10.x, the output is "bar".
Apologies if this was fixed already in 2.11; I don't have access to that version at the moment. I know the foreach closure behavior has changed, but I'm not sure if this is related to its use inside an iterator method.
Already fixed in master (most likely 2.11 too but didn't test it)