This file is indexed.

/usr/bin/2to3-3.5 is in python3.5 3.5.3-1+deb9u1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#! /usr/bin/python3.5
import sys
from lib2to3.main import main

sys.exit(main("lib2to3.fixes"))