/usr/share/doc/m4/examples/foreachq.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 | include(`quote.m4')dnl
divert(`-1')
# foreachq(x, `item_1, item_2, ..., item_n', stmt)
# quoted list, simple version
define(`foreachq', `pushdef(`$1')_foreachq($@)popdef(`$1')')
define(`_arg1', `$1')
define(`_foreachq', `ifelse(quote($2), `', `',
`define(`$1', `_arg1($2)')$3`'$0(`$1', `shift($2)', `$3')')')
divert`'dnl
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