/usr/share/doc/m4/examples/file.m4 is in m4 1.4.18-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | changequote([[,]])dnl
define([[quoteall]], [[patsubst([[[[$*]]]], [[,[ ]+]], [[,]])]])dnl
define([[group]], quoteall(include([[/etc/group]])))dnl
dnl
group()dnl
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