This file is indexed.

/usr/share/tcltk/tcllib1.18/snit/pkgIndex.tcl is in tcllib 1.18-dfsg-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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if {[package vsatisfies [package provide Tcl] 8.5]} {
    package ifneeded snit 2.3.2 \
        [list source [file join $dir snit2.tcl]]
}

package ifneeded snit 1.4.2 [list source [file join $dir snit.tcl]]