No, unless you have a third MVar to control access to the first two
(which doesn't really scale, and is the entire point of STM!)

On 10 November 2016 at 12:34, Lian Hung Hon <hon.lianhung@gmail.com> wrote:
> Dear cafe,
>
> Is it possible to atomically modify two MVars? (I know it can be done with
> TVars)
>
> Regards,
> Hon
>

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--
Michael Walker (http://www.barrucadu.co.uk)