texinfo: @group

Breaks

@need

@page

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15.9 '@group': Prevent Page Breaks
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The '@group' command (on a line by itself) is used inside an '@example'
or similar construct to begin an unsplittable vertical group, which will
appear entirely on one page in the printed output.  The group is
terminated by a line containing only '@end group'.  These two lines
produce no output of their own, and in the Info file output they have no
effect at all.

  Although '@group' would make sense conceptually in a wide variety of
contexts, its current implementation works reliably only within
'@example' and variants, and within '@display', '@format', '@flushleft'
and '@flushright'.  Note: Quotations and Examples.  (What all these
commands have in common is that each line of input produces a line of
output.)  In other contexts, '@group' can cause anomalous vertical
spacing.

  This formatting requirement means that you should write:

     @example
     @group
     ...
     @end group
     @end example

with the '@group' and '@end group' commands inside the '@example' and
'@end example' commands.

  The '@group' command is most often used to hold an example together on
one page.  In this Texinfo manual, more than 100 examples contain text
that is enclosed between '@group' and '@end group'.

  If you forget to end a group, you may get strange and unfathomable
error messages when you run TeX.  This is because TeX keeps trying to
put the rest of the Texinfo file onto the one page and does not start to
generate error messages until it has processed considerable text.  It is
a good rule of thumb to look for a missing '@end group' if you get
incomprehensible error messages in TeX.