/usr/share/acheck/rules/udiff.rules is in acheck-rules 0.3.3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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name root
type loop
test 0
comment
skip ^[^+].*
comment
skip ^\+\+\+.*
#include common
rule
type nop
end_list
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