/usr/share/doc/m4/examples/reverse.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 | define(`reverse', `ifelse(eval($# > 1), 1, `reverse(shift($@)), `$1'', ``$1'')')
``'' => reverse
``hej'' => reverse(hej)
``hej, med, dig'' => reverse(hej, med, dig)
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