This file is indexed.

postinst is in libgcc1 1:6.3.0-18+deb9u1.

This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.

The actual contents of the file can be viewed below.

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#! /bin/sh -e

case "$1" in
    configure)
	docdir=/usr/share/doc/libgcc1
	if [ -d $docdir ] && [ ! -h $docdir ]; then
	    rm -rf $docdir
	    ln -s gcc-6-base $docdir
	fi
esac