/usr/share/doc/m4/examples/pushpop.m4 is in m4 1.4.16-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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pushdef(`hej', `def 1.')
dumpdef(`hej')
pushdef(`hej', `def 2.')
dumpdef(`hej')
pushdef(`hej', `def 3.')
dumpdef(`hej')
pushdef(`hej', `def 4.')
dumpdef(`hej')
popdef(`hej')
dumpdef(`hej')
popdef(`hej')
dumpdef(`hej')
popdef(`hej')
dumpdef(`hej')
popdef(`hej')
dumpdef(`hej')
popdef(`hej')
dumpdef(`hej')
popdef(`hej')
dumpdef(`mac2')
popdef(`mac2')
dumpdef(`mac2')
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