[m-dev.] Pretty printing non-canonical types

[Ralph Becket]

Mark Brown, Monday,  8 October 2007:
> 
> I don't think we should try to implement the user defined equality, but
> format/8 should still be cc_multi.

You don't need to make doc a non-canonical type: it's only format/8
which needs to be cc_multi.  It turns out this isn't a problem at all.
I'll post a new diff in a minute.

-- Ralph
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