Re: maybe-commit-and-make-ready-and-block

   Date: Tue, 15 Sep 2009 16:38:40 -0400
   From: Taylor R Campbell <[email protected]>

   That would make MAYBE-COMMIT-AND-MAKE-READY-AND-BLOCK mostly
   unnecessary, as well as MAYBE-COMMIT-AND-MAKE-READY and
   MAYBE-COMMIT-AND-CHANNEL-{READ,WRITE}...

On second thought, of course this wouldn't obviate the need for
MAYBE-COMMIT-AND-CHANNEL-READ.  And of course there are plenty of
problems with making these hooks compose in a nice way.  E.g., perhaps
there are ordering constraints on the procedures to be run on success
or failure, which are not related to the order in which I added them
to the hooks.  But I'd still like a PROVISIONAL-MAKE-READY (and maybe
a pony).