Re: doc: mfcalc: demonstrate %printer

[Akim Demaille]

My current proposal to document follows.  Writing it shows
that I should provide a consistent name for the output stream
in the implementation.  C++ used debug_stream(), which is
uselessly complex.  We used to use yyout, but that clashed
with some #define that flex exports in its headers
(see http://lists.gnu.org/archive/html/help-flex/2002-11/msg00053.html
for instance).  So we moved to yyoutput, which seems uselessly
long to me.  What people would think of yyo?  To deploy in a
backward compatible way, of course.

Once this patch is tuned and accepted for master, I will back-port
it for maint, as I really want to see %printer documented).

0001-doc-mfcalc-demonstrate-printer.patch
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