> How does an atomic block differ from one in which all variables are
> implicitly hypotheticalized?
I assume that the atomicness being controlled by some kind of lock on
entry, it also applies to I/O and other side-effecty things that you
can't undo.

Hats are no worse for being made by ancient hatters, and good butter can
be bought in a shop that has no jazz-band.  -- J.B. Morton (Beachcomber)
P.S. --- Tell  Saunders that he  must not leave cat's  meat on  my desk.
http://surreal.istic.org/ old-fashioned quality within the McQuary limit

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