Diverted text can be undiverted explicitly using the builtin
undivert(opt NUMBER, ...)
which undiverts the diversions given by the arguments, in the order
given. If no arguments are supplied, all diversions are undiverted, in
The expansion of `undivert' is void.
This text is diverted.
This text is not diverted.
=>This text is not diverted.
=>This text is diverted.
Notice the last two blank lines. One of them comes from the newline
following `undivert', the other from the newline that followed the
`divert'! A diversion often starts with a blank line like this.
When diverted text is undiverted, it is *not* reread by `m4', but
rather copied directly to the current output, and it is therefore not
an error to undivert into a diversion.
When a diversion has been undiverted, the diverted text is discarded,
and it is not possible to bring back diverted text more than once.
This text is diverted first.
=>This text is diverted first.
This text is also diverted but not appended.
=>This text is also diverted but not appended.
Attempts to undivert the current diversion are silently ignored.
GNU `m4' allows named files to be undiverted. Given a non-numeric
argument, the contents of the file named will be copied, uninterpreted,
to the current output. This complements the builtin `include' (
Include.). To illustrate the difference, assume the file `foo'
contains the word `bar':
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