This file is indexed.

/usr/src/gcc-8/debian/cpp-BV-CRB.preinst.in is in gcc-8-source 8-20180414-1ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#!/bin/sh

set -e

if [ "$1" = "upgrade" ] || [ "$1" = "configure" ]; then
    update-alternatives --quiet --remove @TARGET@-cpp /usr/bin/@TARGET@-cpp-@BV@
fi

#DEBHELPER#

exit 0