Small question about os.exit and __gc

[Dio Darkclainer <darkclainer@...>]

Hi all! 

In stand-alone lua interpreter:

a = {__gc = function() print'exit' end}

setmetatable(a,a)

os.exit()

-> nothing to print.

But if i exit with combination <Ctrl+d>  all Ok.

What's the problem?

Thanks!