/usr/share/doc/m4/examples/indir.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 6 7 8 9 10 | define(`%%$$##', `>>>$0<<< cnt $#')
# indir(`%%$$##', nonsens, nonsens)
indir(`%%$$##', nonsens, nonsens)
# indir(`indir', `%%$$##', nonsens)
indir(`indir', `%%$$##', nonsens)
# indir(`indir', `indir', `indir', `indir', `%%$$##')
indir(`indir', `indir', `indir', `indir', `%%$$##')
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