/usr/share/doc/m4/examples/quote.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 | divert(`-1')
# quote(args) - convert args to single-quoted string
define(`quote', `ifelse(`$#', `0', `', ``$*'')')
# dquote(args) - convert args to quoted list of quoted strings
define(`dquote', ``$@'')
# dquote_elt(args) - convert args to list of double-quoted strings
define(`dquote_elt', `ifelse(`$#', `0', `', `$#', `1', ```$1''',
```$1'',$0(shift($@))')')
divert`'dnl
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